3.90 M33 Install Guide

[x3sphere]

Here is a step by step guide for installing the newly released 3.90 M33. Please note that you must be running 3.52 M33-3, or higher to begin this installation. Do note that if you're already running 3.80 M33 and have a WiFi connection, you can simply update to 3.90 M33 by selecting Network Update from the PSP XMB.

Installation Guide

First grab the 3.90 M33 files (http://exophase.com/files/psp/390m33.rar) and extract them.

1. Copy the UPDATE folder contained in the archive to X:/PSP/GAME

2. Download the 3.90 EBOOT (http://exophase.com/files/psp/390.PBP), and then place it in X:/PSP/GAME/UPDATE

3. Navigate to the Game menu on the PSP and execute the program, it will not run unless there is 78 percent battery free.

4. Press X and the update process will start. Yes it may look similar to a regular Sony update but don't worry!

5. Once finished, the updater will ask you to press X or O to reboot. You MUST do this, otherwise you'll end up with a brick.

6. You've successfully installed 3.90 M33!.

[pspknightx]

Does this update include the skype?
I read the read me and there is no mention about skype

[x3sphere]

Does this update include the skype?
I read the read me and there is no mention about skype

It includes Skype yes, but only for Slim PSPs.

[pspknightx]

Thanks for the fast reply :)
For PSP2000 japan model, after update it, will it appear the skype under internet option?
Cause one of my friend after update to the official firmware, it doesnt appear skype option.

[x3sphere]

Thanks for the fast reply :)
For PSP2000 japan model, after update it, will it appear the skype under internet option?
Cause one of my friend after update to the official firmware, it doesnt appear skype option.

Sony have disabled the Skype function for Japan region units, since the microphones aren't available there yet.

But custom firmware has an option to change region in the recovery menu, so that may work.

[pspknightx]

Mine PSP is 2000 japan as well.
Which means if i want to use skype, i just have to change the region to other country, then the skype will be available? I just bought my PSP Slim and feel sad when Sony announced that japan model not supported with skype:(

[x3sphere]

Mine PSP is 2000 japan as well.
Which means if i want to use skype, i just have to change the region to other country, then the skype will be available? I just bought my PSP Slim and feel sad when Sony announced that japan model not supported with skype:(

Yes it should work. Can't tell you for sure since I don't have a Japanese unit. But if I change my region to Japan, then the Skype icon goes away. So that's likely the only setting preventing it from showing.

[pspknightx]

I see. I will give it a try after more update for 3.90m33 for my PSP Slim. Charging for my PSP Phat now and will be updated in 2 hours later. :D

[sasan50cent]

Thanks for the guide .
How can i reflash 3.90M33 ?

[pspknightx]

Thanks for the guide .
How can i reflash 3.90M33 ?

U mean u want to format after update to 3.90m33?
Hold R when u boot up your psp, then simply go to advance > format flash1 and reset, wait for a while then everything will be reset. :smile:

[dennis96411]

No he meant that if he bricks it he want to reflash it. I have no idea, but try downgrade to 1.5 (WARNING!!: Change your language to ENGLISH before downgrade, or it'll be brick anyway when downgraded)then update to 3.52 M33 then a patch. After that you can upgrade to 3.90 M33 again. If you use pandora you don't have to worry about changing the language.

[pspknightx]

But if you are PSP slim, do not downgrade to 1.5 as Slim doesnt have 1.5 kernel (future time maybe, if Tima Machine by DA complete :P). Use pandora v4 to update to 3.80m33-5 and upgrade to 3.90m33.

[sasan50cent]

My psp full bricked ! :bored:
will use pandora , thanks . :wink:

[AznSaiyan]

I dont get it. I just want to be sure. I have 3.80 m33-5.

If i have internetconnection i just go to network update? but if i do that wont it go to normal firmware from sony?

I am a noob so please answer.

If i update there i still have my custom psp?

Is it a new function so you dont have to download those update? Please explain


I dont have a pandora battery because I had let a boy changed to 3.80 m33-5 for me so i dont have a pandora battery. also where can i get a pandora battery? Can you make one by yourself by the way?

DO I NEED A PANDORA BATTERY to do that? Also do i have to change in english first before i do that?

also what does xmb means? i mean the network update xmb. can one of you make a pic of that?

[x3sphere]

I dont get it. I just want to be sure. I have 3.80 m33-5.

If i have internetconnection i just go to network update? but if i do that wont it go to normal firmware from sony?

I am a noob so please answer.

If i update there i still have my custom psp?

Is it a new function so you dont have to download those update? Please explain


I dont have a pandora battery because I had let a boy changed to 3.80 m33-5 for me so i dont have a pandora battery. also where can i get a pandora battery? Can you make one by yourself by the way?

DO I NEED A PANDORA BATTERY to do that? Also do i have to change in english first before i do that?

also what does xmb means? i mean the network update xmb. can one of you make a pic of that?

If you hold R during bootup and enter the configuration mode "Use M33 Network Update" should be enabled. What this does is download the latest M33 update from dark-alex.org when you select the Network Update option.

You can create a Pandora battery on 3.80 M33-5. Here's a guide on how to do it:

http://forums.exophase.com/showthread.php?t=3780

Though I recommend you buy an extra battery just for Pandora, so that you can always restore your PSP's firmware if something goes wrong.

[AznSaiyan]

do i have to put a new memory stick?

[x3sphere]

do i have to put a new memory stick?

No, all it does is install some files to your memory stick. So, after you create a Pandora, the files can stay on there and you can continue using the MS as normal.

[V0dka_88]

It includes Skype yes, but only for Slim PSPs.

It write on the readme that we must use 3.80 SoNY E.Boot and rename it with 3.90.PBP

is that correct to use 3.80 EBOOT? or 3.90 EBOOT was available.. thx:blushing:

[AznSaiyan]

after install the fw. dont you have to install flash?

[x3sphere]

It write on the readme that we must use 3.80 SoNY E.Boot and rename it with 3.90.PBP

is that correct to use 3.80 EBOOT? or 3.90 EBOOT was available.. thx:blushing:

no, use the 3.90 EBOOT.

[V0dka_88]

no, use the 3.90 EBOOT.

ic, thanks:biggrin:

[itsadamlikewhoa]

so does this come with the 1.50 kernel? or do I need to download it? and if so, I know here to get the kernel.. but, where do i get the 1.50 update that I rename 150.pbp?

[Acerthief]

so does this come with the 1.50 kernel? or do I need to download it? and if so, I know here to get the kernel.. but, where do i get the 1.50 update that I rename 150.pbp?


You'll have to add the kernel separately. Here's the 150.PBP (http://72.29.74.204/%7Eexophase/external/150.PBP)

[tjsama]

Do note that if you're already running 3.80 M33 and have a WiFi connection, you can simply update to 3.90 M33 by selecting Network Update from the PSP XMB.


I'm using 3.80 m33-5 on slim. So do I need to have the 3.90 EBOOT file when I do network update?

[x3sphere]

I'm using 3.80 m33-5 on slim. So do I need to have the 3.90 EBOOT file when I do network update?

No, it will download that through Network Update as well.

[taluks]

im newbie here and just want to learn how to update my psp. i have pspslim with 3.71 M33-2 and i want it to update to 3.90 M33 all i have to do is simply follow your install guide.

[Acerthief]

im newbie here and just want to learn how to update my psp. i have pspslim with 3.71 M33-2 and i want it to update to 3.90 M33 all i have to do is simply follow your install guide.


Yup you got it. Don't need anything else, just the follow up the guide and you'll be fine. :D

[taluks]

wow thanks,, by the way whats the difference if i didnt update my pspslim to 3.90

[Acerthief]

wow thanks,, by the way whats the difference if i didnt update my pspslim to 3.90


Actually, nothing XD.
But if you have 3.80M33, I'd recommend you to go up to 3.90M33 because it has the same thing, but 3.90M33 has skype!

[xingkia]

erm. gt a problem installing the new firmware. stuck at the pls wait screen. any idea why? using a 3.52m33-4 psp phat now. any help will be greatly appreciated.

Problem solved.
Just want to share the simple solution with the bros out here.

Go to Recovery mode and revert your kernel to 3.XX where X is the custom firmware you’re currently on. Example, if you’re using 3.71 M33-4 and you set your kernel to 1.50, it won’t upgrade unless you set it back to 3.71 kernel.

:)

[Di Vaio]

when i run the update i get "the game could not be started (DADADADA)"? what am i doing wrong?

[x3sphere]

when i run the update i get "the game could not be started (DADADADA)"? what am i doing wrong?

What firmware are you on?

[AznSaiyan]

a question i have a japanese version.

and i have installed this firmware. Now i dont see go messenger. I have changed the region but still not in it. Did i have to changed the region before the install?

another thing is. when i have changed the region do i have to save it? if yes how?



Also why cant i play the snes games? in 3.40 oe-a i could play those games but now i cant? doenst 3.90 m33 has all the features?

[pspknightx]

a question i have a japanese version.

and i have installed this firmware. Now i dont see go messenger. I have changed the region but still not in it. Did i have to changed the region before the install?

another thing is. when i have changed the region do i have to save it? if yes how?


Only Europe region can see the GO!Messenger. Go to Recovery mode, then configuration, press the region until "Eur", after that press back > Exit.
Back to XMB and go to Internet, you should see the icon of GO!Messenger there.

What type of PSP you are using? Slim or Phat? Maybe the emulator you are using can only be used under 1.50 kernel. You have to download the latest emulator which can be run under 3.xx kernel. Plus, PSP Slim cannot use 1.50. (In my knowledge :P)

[AznSaiyan]

wahahaha lol I have fat and slim and both are japanese version.

Also both has the skype and go messenger now.

I just did something in recover mode and da taaaa skype and go messenger are in there. Ofcourse fat dont have the skype.

[cdh]

Hi,

When trying to upgrade my Fat from 3.80 M33-5 (first through network update or afterwards via the starter on the memory stick) I get the following error:
The system configuration of this PSP system does not appear to be correct. The update cannot be completed. Contact tehnical support for assistance. (DRNFFFFFFB0)

I have already reset my PSP and tried it again, but it still didn't work.
The PSP is set to the 3.80 kernel.


edit: when i try to use the 390.PBP file which is available as download in this thread it tells me "incorrect file" while verification

[Acerthief]

Hi,

When trying to upgrade my Fat from 3.80 M33-5 (first through network update or afterwards via the starter on the memory stick) I get the following error:
The system configuration of this PSP system does not appear to be correct. The update cannot be completed. Contact tehnical support for assistance. (DRNFFFFFFB0)

I have already reset my PSP and tried it again, but it still didn't work.
The PSP is set to the 3.80 kernel.


edit: when i try to use the 390.PBP file which is available as download in this thread it tells me "incorrect file" while verification

You have a TA-086 mobo, and you're missing key8 (aka brightness key). You'll need to find it off the net for one and put it back in with "IDStorage Manager. Or else the key issue will always be there.

As for 390.PBP, either re-download again, or sadly you have a faulty memory stick.

[jonodiel]

so i need to downgrade the version 3.80 before getting a 3.90 M33? sorry i duno things abt psp

[x3sphere]

so i need to downgrade the version 3.80 before getting a 3.90 M33? sorry i duno things abt psp

Will need to use Pandora to install custom firmware if you're on official 3.80.

http://forums.exophase.com/showthread.php?t=3780

But creating the battery, installing memory stick files, requires a PSP already running custom firmware. So you'll need to find someone with custom firmware that can do this for you.

[imgod2]

y when i install it appear "requirer 3.54m33-3 or higher"?
but my version is already 3.54m33-4...
so wat happen??

[Acerthief]

y when i install it appear "requirer 3.54m33-3 or higher"?
but my version is already 3.54m33-4...
so wat happen??

Go into the Recovery Menu, and Choose "Configuration" -> "Set GAME folder kernel" to 3.52.

[imgod2]

Go into the Recovery Menu, and Choose "Configuration" -> "Set GAME folder kernel" to 3.52.

sry..
mine is 3.52 m33-4..
can i know where is d recovery menu??
i still a noob in psp upgrade staff.. :laugh:

[Clint]

sry..
mine is 3.52 m33-4..
can i know where is d recovery menu??
i still a noob in psp upgrade staff.. :laugh:

To get into the recovery menu, make sure your PSP is completely off. Then, hold the R button as you're starting your PSP, and it will take you to a configuration menu. Then, do as Acertheif said, hit X on "Configuration" and change the option for "Set GAME folder kernel" to 3.52. :)


Clint

[pspwii360gamer]

I downloaded everything onto my psp, but when i go to Memory Stick, it's there but it says Data Corrupted, i don't know what to do, can you please help me?

[AznSaiyan]

what firmware are you running?

[VK-91]

Hi,

I'm kinda new to the psp world so please help...

I have the old PSP (fat one), with 3.80 firmware, the legit one, from sony website, to install the 3.90 custom firmware will I:

1. Have to download and install the legit 3.90 firmware first?

2. Have to have a pandora battery?

Also once i install the 3.90MM3 firmware, wont i be ble to dowanload anything else from the sony site (via the PSP?)

Thanks for reading.

[x3sphere]

Hi,

I'm kinda new to the psp world so please help...

I have the old PSP (fat one), with 3.80 firmware, the legit one, from sony website, to install the 3.90 custom firmware will I:

1. Have to download and install the legit 3.90 firmware first?

2. Have to have a pandora battery?

Also once i install the 3.90MM3 firmware, wont i be ble to dowanload anything else from the sony site (via the PSP?)

Thanks for reading.

Custom firmware functions the same way official firmware does, only it has extra capabilities added in, so everything will work. But you will need a Pandora battery to install custom firmware on 3.80.

[VK-91]

Custom firmware functions the same way official firmware does, only it has extra capabilities added in, so everything will work. But you will need a Pandora battery to install custom firmware on 3.80.

So just to confirm, i follow the orginal instructions written at the start of the thread but all i do is change my sony battery to a pandora battery?

Also what is pandora (the software) and will i need this aswell?

[x3sphere]

So just to confirm, i follow the orginal instructions written at the start of the thread but all i do is change my sony battery to a pandora battery?

Also what is pandora (the software) and will i need this aswell?

No you can only start following this guide once you're on custom firmware.

There is a guide on setting up a Pandora battery and magic memory stick here:

http://forums.exophase.com/showthread.php?t=3780

You will need another PSP already running custom firmware to complete most of the steps. If you do not know anyone who has a custom firmware PSP then I recommend asking someone over at Noobz (http://forums.noobz.eu/downgrader-support/people-who-can-help-you-unbrickdowngrade-a-psp-using-pandora/0/) to do it for you. There's many people there that will convert your battery and install the memory stick files for free as long as you cover shipping costs.

[donsammy]

on 92% ive got an error.

eroor syas FFFFFFFFE.

[x3sphere]

on 92% ive got an error.

eroor syas FFFFFFFFE.

Weird error, never seen it before, is your PSP working ok?

[donsammy]

Weird error, never seen it before, is your PSP working ok?

it didnt want do do anything, not even a hard boot.
took battery out and back on and nothing, a brick slim psp
i just took battery out, put pandorra and brought it back to life.

[donsammy]

it didnt want do do anything, not even a hard boot.
took battery out and back on and nothing, a brick slim psp
i just took battery out, put pandorra and brought it back to life.


thanks for asking X3

[imgod2]

To get into the recovery menu, make sure your PSP is completely off. Then, hold the R button as you're starting your PSP, and it will take you to a configuration menu. Then, do as Acertheif said, hit X on "Configuration" and change the option for "Set GAME folder kernel" to 3.52. :)


Clint

Go into the Recovery Menu, and Choose "Configuration" -> "Set GAME folder kernel" to 3.52.

nw my psp already 3.90 MM3-2...
thank you very much 4 d help... :biggrin:

[cdh]

You have a TA-086 mobo, and you're missing key8 (aka brightness key). You'll need to find it off the net for one and put it back in with "IDStorage Manager. Or else the key issue will always be there.

As for 390.PBP, either re-download again, or sadly you have a faulty memory stick.

thanks worked like a charm after i created a blank key 8 which then was checked/verified as being "incorrect" and it then used the dl'd key8 from the stick :)

regarding the 390.PBP --> i tried it with 4 different memory sticks (Sandisk and Sony) and i always got this error, but since it worked using the "network update" i don't mind 8)

[warr13]

im lost and new at this my psp is a new one and has version 3.90 what can i do to turn it into homebrew enabled ?? hope i posted in he right area

[bertotherobo]

after installing 3.90 m33-2 and the 1.50 kernel v2, can i switch to a different memory stick? or do i need to have the 150k_installer and UPDATE folder in my memory stick at all times in order for it to continue to work?

[Acerthief]

swap as many memory sticks as you want. :D, the things are installed into the flash memory.

And better yet, you can delete the folder and the eboot as well :D

[tomguyz]

This 3.90M33 is for PSP Slim or normal PSP

[x3sphere]

This 3.90M33 is for PSP Slim or normal PSP

Doesn't matter, works on both.

[toyds]

Hello All,
im totally Newbie and registered just at the moment

I buy PSP here in japan and put 3.80 M33-5 but right now i already updated my PSP to 3.90 M33-2

thanks a lot for this

[TK312]

hey there.

Well ive got a fat PSP which had 3.52 M33-4 installed on it.
I unzip everything correctly then click the 3.90 M33 updater.

It pops up with a black screen -

Unpacking.... done.
Please Wait....

and it hangs there.

know whats wrong?

[Acerthief]

hey there.

Well ive got a fat PSP which had 3.52 M33-4 installed on it.
I unzip everything correctly then click the 3.90 M33 updater.

It pops up with a black screen -

Unpacking.... done.
Please Wait....

and it hangs there.

know whats wrong?


Sounds like a faulty memory stick. What brand and the size is your memory stick?

Also it's better if you don't have a theme modded and the language set to english. :D

[unhappy]

Help!!!!!!
I have by mistake upgraded to 3.90 Official ver from 3.71M33-5 how to go to 3.90 M33-2

[kyoukara]

Hey there I have been having some trouble with updating from 3.52 m33-4 to 3.80/90. When I try and run the update I get to the unpacking bit and then I get to the next screen where it says "Verifying 290.PBH" and the "u235." ok for both and then an error saying error 0x000000000 checking idstroage destination. or somthing similar.
My memory stick is not faulty I have used it in the past for getting 3.40OE and so on plus its an official sony one.

Any help would be appreciated
Thanks.
Alex.

[x3sphere]

Hey there I have been having some trouble with updating from 3.52 m33-4 to 3.80/90. When I try and run the update I get to the unpacking bit and then I get to the next screen where it says "Verifying 290.PBH" and the "u235." ok for both and then an error saying error 0x000000000 checking idstroage destination. or somthing similar.
My memory stick is not faulty I have used it in the past for getting 3.40OE and so on plus its an official sony one.

Any help would be appreciated
Thanks.
Alex.

First I would check to see if your 390.PBP download is corrupted. Make sure it matches the MD5: 64BAE5DD0D0F836BAEDF915FB106E9CC

You can use a program like HashTab (http://beeblebrox.org/hashtab/) to check file MD5s.

If the MD5 matches then the is file ok. Next try formatting the memory stick, then copy all your files back over.

[kyoukara]

Thanks for the reply, I have checked the MD5 thing and it matches but I have not formated the memory stick, I tried two other sticks and I get the same messages >_<

[Acerthief]

Help!!!!!!
I have by mistake upgraded to 3.90 Official ver from 3.71M33-5 how to go to 3.90 M33-2


Universal Unbricker.

[x3sphere]

Thanks for the reply, I have checked the MD5 thing and it matches but I have not formated the memory stick, I tried two other sticks and I get the same messages >_<

Can you type the complete error message you're getting? I did a search on "checking idstorage destination" and couldn't find anything. I'm guessing it says something different.

I'd also try running Chilly Willy's KeyCleaner and fix up any problems it detects with your idstorage keys.

http://forums.exophase.com/showthread.php?t=1238

[kyoukara]

Sorry I made a mistake its not destination but "degeneration". I also don't know how many 0's it is. Thanks for going through the trouble for this, much appreciated.

[alabatusa]

hey, just wondering i had 2.71 firmware, i downgraded to 1.5 using generic downgrader, and upgraded to 3.52m33 from this forum post, but i see it says in this guide you need minimum 3.52m33-3, how do i know wat version i got. i downloaded from exo forum "3.52 m33 install guide"

thanks

[alabatusa]

hi again
i just update to 3.52m33-4, and now none of my keys work, as in i can press anything but my psp doesnt move between tabs, it seems to be working fine as in its not bricked, all the keys were working fine in 3.52m33, in 2.71 and in 1.5, anyone can tell me how to fix this.
whats interesting is that when i go into recovery mode all my keys are working again. i was trying to update to 3.90m33, anyone know how i culd do that from this situation. its just as keys dont work i cant get to my game memory card tab
thanks

[alabatusa]

wow i fixed my error so relieved, i just deactivated vsh menu...

[dick_007]

Having trouble updating my pspfat from 3.52m83 to 3.9 Or 3.7. When I run 3.9 it says I need to update to 3.52, which I already have.

I checked the kernal is set correctly (it is). Any ideas??

[Acerthief]

Having trouble updating my pspfat from 3.52m83 to 3.9 Or 3.7. When I run 3.9 it says I need to update to 3.52, which I already have.

I checked the kernal is set correctly (it is). Any ideas??



Make sure you have 3.52M33-3 or 3.52M33-4

[PSPLad]

great. i had 3.52 M33-3 installed and did EXACTLY what the guide says (i use the old psp not slim) and it said: unpacking... done. and for about 15 minutes now it says Please wait...

it cant take THAT long. i think i will have to shut down my psp but yet that really fears me. also the battery level was 83%


edit: alright i COULD restart it and tried it for another time. it didnt even unpack but gave me directly the message "unpacking... done- Please wait..."

[dick_007]

Make sure you have 3.52M33-3 or 3.52M33-4

Thanks man, worked a treat!!!

[kuzuo]

my psp can't run it... i don't know why... i have a slim psp with 3.90 from network update... i'm trying to put the m33-2 kernel. when i run the installer, the psp says: "the game could not be started (80020148)"

[Acerthief]

my psp can't run it... i don't know why... i have a slim psp with 3.90 from network update... i'm trying to put the m33-2 kernel. when i run the installer, the psp says: "the game could not be started (80020148)"


Official Firmware Can't run homebrews like this.

You can only use the "Universal Unbricker (http://forums.exophase.com/showthread.php?t=3780)" to get you to 3.80M33, then to 3.90M33.


There's a catch though, you need a PSP with custom firmware in order to install the set.

[lkmg]

hi, i have an original Hong Kong version of the psp slim. it is now 3.71 M33. can i used the custon firmware in this website to update to 3.90 M33? i do not need a pandora battery, right? just follow the steps list at the first page? thanks.

[AznSaiyan]

hi, i have an original Hong Kong version of the psp slim. it is now 3.71 M33. can i used the custon firmware in this website to update to 3.90 M33? i do not need a pandora battery, right? just follow the steps list at the first page? thanks.

yes i have a japanese and a hong kong version both are now 3.90 m33-2
just follow the steps.

[PSPLad]

so am i the only person where it says please waite... and nothing happens at all? :sad:

[x3sphere]

so am i the only person where it says please waite... and nothing happens at all? :sad:

Something may be wrong with your memory stick - try formatting it first and see if that helps if not then you will need to try using a different memory stick.

Also make sure you 3.90 EBOOT download is not corrupted. It should match the file size of 24.4 MB (25,654,469 bytes).

[gooders]

Thats so cool have jus updated my fw via wifi, will all future updates be available via wifi?

[x3sphere]

Thats so cool have jus updated my fw via wifi, will all future updates be available via wifi?

Yes all future updates will be available via WiFi. :smile:

[AznSaiyan]

Yes all future updates will be available via WiFi. :smile:

funny thing about this is they added wrong folder in it.

it should be folder 390 and not 380.

I think dark alex will change that next time lol.

[Tienak]

Hello, i'm new to this hacking buissnes but since I saw FF7 on a PSP must say I really wanted to get this going.

So far I have the latest PSP the slim ones with the speaks on the top of the PSP not at the bottom?

Anyway I was just wondering what will I need to get this to work and if it does "brick" does that mean no PSP? And if so how do I know mine won't or not?

If I do get this done is there sites that I go on to download more games say Crash bandicoot or Syndicate wars and so on.

Please type back

Tienak

Edit: One more thing I forgot to mention, people speak of downgrading their PSP...how do I do that?

[x3sphere]

Hello, i'm new to this hacking buissnes but since I saw FF7 on a PSP must say I really wanted to get this going.

So far I have the latest PSP the slim ones with the speaks on the top of the PSP not at the bottom?

Anyway I was just wondering what will I need to get this to work and if it does "brick" does that mean no PSP? And if so how do I know mine won't or not?

If I do get this done is there sites that I go on to download more games say Crash bandicoot or Syndicate wars and so on.

Please type back

Tienak

Edit: One more thing I forgot to mention, people speak of downgrading their PSP...how do I do that?


You can purchase and download PSOne games at the official PlayStation Store (http://store.playstation.com/store/index.vm). Or rip your own game discs (http://forums.exophase.com/showthread.php?t=2047). We don't support piracy here.

Someone who has a Pandora battery and magic memory stick can install custom firmware on your PSP. There are instructions for converting your own battery to Pandora and creating a magic memory stick here (http://forums.exophase.com/showthread.php?t=3780) but in order to do that you need to be already running custom firmware.

So if you don't know anyone nearby that has these items there are few people at Noobz.eu (http://forums.noobz.eu/downgrader-support/people-who-can-help-you-unbrickdowngrade-a-psp-using-pandora/0/) who can install custom firmware on your PSP for free. You'll just need to cover shipping costs.

[x3sphere]

Sorry I made a mistake its not destination but "degeneration". I also don't know how many 0's it is. Thanks for going through the trouble for this, much appreciated.

Run KeyCleaner (http://forums.exophase.com/showthread.php?t=1238) and fix any keys it finds problems with. That should fix the problem.

I will warn you though, there is always a small chance of bricking when making changes to the idstorage. Depending on how corrupt your idstorage is, the brick may not be recoverable even with Pandora.

[iNvidiousRG]

i got a question...i already have 3.90 M33 but my friend had to send me the 390.PBP so im not sure how that file was made. Anyway my question is is that after you downloaded the offical 3.90 EBOOT was all i needed to do was rename that EBOOT to 390.PBP to get that PBP file? sorry i just want to get more understanding of all this stuff.

[x3sphere]

i got a question...i already have 3.90 M33 but my friend had to send me the 390.PBP so im not sure how that file was made. Anyway my question is is that after you downloaded the offical 3.90 EBOOT was all i needed to do was rename that EBOOT to 390.PBP to get that PBP file? sorry i just want to get more understanding of all this stuff.

Yes. All 3.90 EBOOTs are the same. If it's not named as 390.PBP then just rename it.

[PSPLad]

This just wont do the trick for me and I don't know why.
-I have a normal/old PSP.
-SanDisk Memory Stick PRODuo 4.0 GB (I formatted it)
-I am on 3.52 M33-3
-Battery is 85%
-System language is English

So I put the whole UPDATE folder containing EBOOT.PBP inside X:/PSP/GAME. I also put 390.PBP inside the update folder.

Then I try to run it and it says unpacking for 1 second. After that it tells me to wait and nothing happens (I gave up after 20 minutes).

-Did I do ANYTHING wrong?
-Is there some other firwmare I could update to first and then try to install it?
-Or can I downgrade to some other firmware again and then try to update to the latest firmware that isnt M33 though?
-Any idea what I can do so I can install 3.90 M33?

thanks a lot

[iNvidiousRG]

Yes. All 3.90 EBOOTs are the same. If it's not named as 390.PBP then just rename it.
lol i knew it damn my friend made it so confusing :mad1: lol anyway thanks fo clearing it up

[sinshixxi]

This just wont do the trick for me and I don't know why.
-I have a normal/old PSP.
-SanDisk Memory Stick PRODuo 4.0 GB (I formatted it)
-I am on 3.52 M33-3
-Battery is 85%
-System language is English

So I put the whole UPDATE folder containing EBOOT.PBP inside X:/PSP/GAME. I also put 390.PBP inside the update folder.

Then I try to run it and it says unpacking for 1 second. After that it tells me to wait and nothing happens (I gave up after 20 minutes).

-Did I do ANYTHING wrong?
-Is there some other firwmare I could update to first and then try to install it?
-Or can I downgrade to some other firmware again and then try to update to the latest firmware that isnt M33 though?
-Any idea what I can do so I can install 3.90 M33?

thanks a lot
you need 3.52 M33-4, not M33-3. also set your Kernell to 352 and not in 150 (set this in Recovery Mode - hold R button when you start up psp)

[Nickepe]

If I have firmware 1.50 and have used devhook before, is this the thing to do now instead? I can´t find any new versions of devhook.

If I install 3.90 M33, am I still having firmware 1.50 or have I installed a new firmware?

Hope this isn´t a stupid question... :blushing:

/Nickepe

[Acerthief]

If I have firmware 1.50 and have used devhook before, is this the thing to do now instead? I can´t find any new versions of devhook.

If I install 3.90 M33, am I still having firmware 1.50 or have I installed a new firmware?

Hope this isn´t a stupid question... :blushing:

/Nickepe


This is a bit different. You have to upgrade to 3.52M33 (http://forums.exophase.com/showthread.php?t=2732) first, then update the 3.52M33-4 Patch (http://forums.exophase.com/showthread.php?t=3185). And then upgrade to 3.90M33 with this guide, along with the 3.90M33-2 Patch (http://exophase.com/files/psp/390m33_2.rar) and the 1.5 Kernel Patch (http://forums.exophase.com/showthread.php?t=5634).

[Nickepe]

...and does that mean I don´t have firmware 1.5 anymore but Sonys original 3.90 firmware?

Or does it mean I have 1.5 somewhere but my PSP thinks I have 3.90, like devhook?

[frisomel]

this is a noob question..does installing 3.90 on the phat psp, the same with slim?..tnx..

[x3sphere]

...and does that mean I don´t have firmware 1.5 anymore but Sonys original 3.90 firmware?

Or does it mean I have 1.5 somewhere but my PSP thinks I have 3.90, like devhook?

It replaces with the 1.5 firmware on your PSP with 3.90 M33, which supports loading homebrew and backed up games.

this is a noob question..does installing 3.90 on the phat psp, the same with slim?..tnx..

Yes it works on both models.

[Nickepe]

This is so incredibly sweet, it works great!!!
Thx all for your help!

/Nickepe

[bo_nk]

sorry for the stupid question, but i didn't follow the upgrade history for quite some time ;-((

i'm with 3.40oe.
some new 'applications' ask me to upgrade.
how can upgrade to 3.90 m33?

[x3sphere]

sorry for the stupid question, but i didn't follow the upgrade history for quite some time ;-((

i'm with 3.40oe.
some new 'applications' ask me to upgrade.
how can upgrade to 3.90 m33?

Install 3.52 M33 (http://forums.exophase.com/showthread.php?t=2732) then upgrade to 3.52 M33-3 (http://forums.exophase.com/showthread.php?t=3168).

You can follow the 3.90 M33 install guide in this thread once on 3.52 M33-3.

[dream]

Hi guys, i running 3.52 M33-3 and follow the guide for upgrading to 3.90 M33.

After i press X to go for the update, it say idstorage not correct and i press X to correct it and it says successfully. Before updating, i set to "UMD Auto-start to OFF, then i proceed for 3.90M33 update, but it shows a white blank screen displaying nothing.. i waited and still no progess..i turn off my psp and now it cant turn back on. I tried hold the R button while turning on the psp but it doesnt work as well...

Is that a sign of bricking?

Pls help..

Thanks!

[x3sphere]

Hi guys, i running 3.52 M33-3 and follow the guide for upgrading to 3.90 M33.

After i press X to go for the update, it say idstorage not correct and i press X to correct it and it says successfully. Before updating, i set to "UMD Auto-start to OFF, then i proceed for 3.90M33 update, but it shows a white blank screen displaying nothing.. i waited and still no progess..i turn off my psp and now it cant turn back on. I tried hold the R button while turning on the psp but it doesnt work as well...

Is that a sign of bricking?

Pls help..

Thanks!

Yes your PSP is bricked. Someone with a Pandora battery will have to try restoring your PSP. Well you could do it yourself if you buy a pre-converted battery or by hard modding the one you currently have. You'd also need a memory stick reader to copy the Pandora files to your memory stick.

[dream]

Thanks x3sphere!

[bo_nk]

I also want to shout:

Thanks x3sphere!

everything went smooth and fast

[Infernal]

I read the installer readme on this forum, when I tried to execute the file, it said "game could not be started"

Would this be because I only have 50% battery (I'm charging)?

Or is it because the file is corrupt

I read that I need 78% but that's not the error I would assume to expect :x

[x3sphere]

I read the installer readme on this forum, when I tried to execute the file, it said "game could not be started"

Would this be because I only have 50% battery (I'm charging)?

Or is it because the file is corrupt

I read that I need 78% but that's not the error I would assume to expect :x

What firmware is your PSP currently running? Hold R when booting up your PSP and make sure the GAME folder kernel is set to 3.X.

And, yeah, the battery needs to be around 78 % charged, but that's not what this error is referring to.

[Infernal]

I was running the original firmware, I upgraded to the 1.5 on the main page. Then the 3.52 then the ms-33-3 i think or w/e haha

Now im doing that to --> 3.90

It's been on please wait... for like 10min :x

[Infernal]

I'm good on that but my screen has been on

Unpacking... done.
Please wait...

for the last 10-15 min on the 3.52ms33-3 to --> 3.90 release 3


should it be doing that?

[Infernal]

Still on same screen :X

[x3sphere]

Hmm... you probably have a slow memory stick. It should only take about 5 minutes but for some people it takes around an hour.

[Infernal]

I'm trying to upgrade to any other version --> 3.71, 3.8

And when I do, it says I need version 3.52m33-3 or higher...

I have 3.52m33-4..

[x3sphere]

I'm trying to upgrade to any other version --> 3.71, 3.8

And when I do, it says I need version 3.52m33-3 or higher...

I have 3.52m33-4..

On my other post, I said: Hold R when booting up your PSP and make sure the GAME folder kernel is set to 3.X.

If the kernel is not set to 3.X, that's why it's saying you need 3.52 M33-3 or higher.

[Infernal]

Works thank you :)!!!

[srichards00]

Just got a PSP slim.

It has the packaged firmware from Sony 3.8 and when I do everything on the instructions I get "Game could not be started" with an error code of 80020148.

I have a Lexar 4gig Memory stick.

Any ideas? :confused1:

Thanks in advance!

[Acerthief]

Just got a PSP slim.

It has the packaged firmware from Sony 3.8 and when I do everything on the instructions I get "Game could not be started" with an error code of 80020148.

I have a Lexar 4gig Memory stick.

Any ideas? :confused1:

Thanks in advance!


These app downloaded here are called "homebrew", which sadly, doesn't run on Official Firmware.

There's a guide that teaches you to use "The universal unbricker" to take you to 3.90M33-3 directly, but you'll need a PSP with custom firmware already to install the set for you.

[srichards00]

There's no other way? I don't know anyone else who has a psp ><, let alone a one with custom firmware. Bah. If that's the only way, how was the first custom software that was released installed on a psp, like it had to start somewhere so there has to be some way to do it aside from the above mentioned. Right?

[n0aim]

Hi I did ALL steps up to 3, my psp is fully charged, i start the update and then it says "The game could not be started (80020148)"...

Think you can help me? Thx in advance.

[Acerthief]

Hi I did ALL steps up to 3, my psp is fully charged, i start the update and then it says "The game could not be started (80020148)"...

Think you can help me? Thx in advance.

If you have official firmware on your PSP currently, this will not apply.

[Extrapunkt]

5. Once finished, the updater will ask you to press X or O to reboot. You MUST do this, otherwise you'll end up with a brick.

ok hey really stupid question but i wanna make sure because i wont get near a pandoras battery for a while and dont wanna brick my psp right after i bought it xD

so do you mean i must press X or i must press O to reboot? sry im a foreign exchange students and my english is good i guess but sometimes i get confused ^^

would be nice if anyone could help me thanks =)

[d1ddy]

good guide

[bearx]

hi, i've just updated to 3.90 m33.
all my games are working fine, but when i tried to load patapon, it shows me an error and the game doesn't load.

the error is

load failed.
the data is corrupted.
(80110306)

can anyone help?

[Salamandar]

Hi guys. I just updated my PSP to 3.90 M33, the games are working fine. But now my save files are corrupted. I've read somewhere that some save files from older FW wouldn't work though...

Anyway, is there a way to convert those files into ones compatibles with 3.90 M33 ? I used to play with 3.40 OE-A.

Thanks :)

[Acerthief]

Hi guys. I just updated my PSP to 3.90 M33, the games are working fine. But now my save files are corrupted. I've read somewhere that some save files from older FW wouldn't work though...

Anyway, is there a way to convert those files into ones compatibles with 3.90 M33 ? I used to play with 3.40 OE-A.

Thanks :)

Do you mean by PSX Games? or PSP Games?
Try backing up music/video/gamesaves and format the card on the PSP.

[Salamandar]

PSP Games. I've done what you told me to do and it still doesn't work. :(

The exact message is : "Load Failed. The data is corrupted" btw

[x3sphere]

PSP Games. I've done what you told me to do and it still doesn't work. :(

The exact message is : "Load Failed. The data is corrupted" btw

Do new saves work? If so, the saves that aren't working are definitely corrupted. I think it is due to a saving bug in 3.40 OE and DevHook.

There's no way to convert saves, but you could install TimeMachine to load the hybrid 1.50 + 3.40 firmware. Your old saves should work in that.

[Salamandar]

Yeah, new saves are working. Well that's what I was thinking too. I'll try TimeMachine, thanks :)

[anubis93703]

OK here i go, i have phat psp 3.80 M33-5, paid a guy 10 bucks to do it.... i want to update it to the new 3.90 M33-3....

all i need to do is download the update and install just like a sony update?? help me please! thanks..

anubis93703 / harrisjohn@comcast.net

[x3sphere]

OK here i go, i have phat psp 3.80 M33-5, paid a guy 10 bucks to do it.... i want to update it to the new 3.90 M33-3....

all i need to do is download the update and install just like a sony update?? help me please! thanks..

anubis93703 / harrisjohn@comcast.net

Basically everything on how to install 3.90 M33 is explained in the first post of this thread. Is there something in particular that you're having trouble with?

[anubis93703]

No, just a bit concerned im gunna screw it up.. i see it can use the wifi and update it.... so basically, i wifi the update and ill get the 3.90 m33-3?

[x3sphere]

No, just a bit concerned im gunna screw it up.. i see it can use the wifi and update it.... so basically, i wifi the update and ill get the 3.90 m33-3?

Yes, or you can do the manual installation (perhaps safer if you don't know what you're doing)

[anubis93703]

which one is safer??? manuel or with the wifi?? i downloaded to wifi version but yet to install...

[x3sphere]

which one is safer??? manuel or with the wifi?? i downloaded to wifi version but yet to install...

As I said in the above post... the manual installation is safer if you don't know what you're doing.

[anubis93703]

Ok, thanks so much.... ended up doing the wifi and it worked fine.... dont know the diffence, but im kind od weird about having the most up to date... i appreciate the help!! can i ask you a diffrent question... how do i install the 1.50 kernal and and psptube?

email me please...

harrisjohn@comcast.net

[x3sphere]

Ok, thanks so much.... ended up doing the wifi and it worked fine.... dont know the diffence, but im kind od weird about having the most up to date... i appreciate the help!! can i ask you a diffrent question... how do i install the 1.50 kernal and and psptube?

email me please...

harrisjohn@comcast.net

There's instructions on how to install it in the 1.5 kernel release thread:

http://forums.exophase.com/showthread.php?t=5634

As for PSPTube, download it here (http://exophase.com/files/psp/PSPTube20080127.zip), extract the archive, then copy over the "PSPTube" folder to X:/PSP/GAME on your memory stick. The application should now show up in your Game menu.

[anubis93703]

awsome man! thanks..... this is why the psp community rocks..... dare i ask you one more question?? where to download psp games / iso's?

thanks!!

anubis93703.....

[x3sphere]

awsome man! thanks..... this is why the psp community rocks..... dare i ask you one more question?? where to download psp games / iso's?

thanks!!

anubis93703.....

No problem :) As for your other question - we don't allow discussion of downloaded games here.

[anubis93703]

Okie dokie....

;)

[fox09]

bah, disregard.

[khanmuin]

hello can any one help me!!
i have a psp Custom Firmware 3.71M33-2 it works well but some new iso images creates problem (like flow) what should i do.

should i update?

is it safe?

[x3sphere]

hello can any one help me!!
i have a psp Custom Firmware 3.71M33-2 it works well but some new iso images creates problem (like flow) what should i do.

should i update?

is it safe?

Perhaps flOw requires a firmware higher than 3.71 M33, not sure. But to answer your question, there is no harm in updating.

[mod_erator]

Hye i'm still new here..if i install this cw can i play iso or cso game dat i save in my memory stick? i meant i dont have to buy the the original umd... currently my cw is 3.71 m33-2 and i can play the iso and cso games dat i saved in my memory stick

[x3sphere]

Hye i'm still new here..if i install this cw can i play iso or cso game dat i save in my memory stick? i meant i dont have to buy the the original umd... currently my cw is 3.71 m33-2 and i can play the iso and cso games dat i saved in my memory stick

You have to buy the original UMD. It's illegal if you don't.

[Halu]

i am having incorrect or in existant of 1.50 at root?
what does this mean. i have alrady put it inside

[Halu]

why is the game folder name as game380 not game390??

[Coy]

why is the game folder name as game380 not game390??

good question.

[FearEvil19]

why is the game folder name as game380 not game390??

Because Alex forgot to change it.
Hopefully, when we get to 4.0 he will change to GAME4XX

[curitsc]

I have 3.90 m33-2 installed and running when I try to update to m33-3 it just shows corrupted data under games and will not load. HELP

[x3sphere]

I have 3.90 m33-2 installed and running when I try to update to m33-3 it just shows corrupted data under games and will not load. HELP

I already replied to your same question here:

http://forums.exophase.com/showthread.php?p=35987#post35987

Please don't double post *_*

[ardentious]

After dusting off my PSP, I got myself from way-back and up to 3.52 M33 using x3sphere's sticky'd guide [http://forums.exophase.com/showthread.php?t=2732].

Proceeding immediately to the next stage, I headed to x3sphere's 3.90 M33 post, where I'm informed I need 3.52 M33-3.

I went through both posts again, looking for info on stepping up from 3.52 M33 to 3.52 M33-3 so I can make the final leap up to 3.90 M33. I swear I didn't find a thing, and I guess I'm not surprised, as right now, my brain is bleeding from a lethal intake of version-reading-itis and I can no longer discern number and letter combinations from complete jibberish.

I wonder if someone might be kind enough to direct me to:

3.52 M33 -> 3.52 M33-3 directions/information

I would humbly suggest that x3sphere's otherwise-excellent guide for 3.52 M33 be updated at the top to reflect an incremental tweak to M33-3 (or M33-4, as I've seen referenced).

Thanks much for your time.

[Acerthief]

After dusting off my PSP, I got myself from way-back and up to 3.52 M33 using x3sphere's sticky'd guide [http://forums.exophase.com/showthread.php?t=2732].

Proceeding immediately to the next stage, I headed to x3sphere's 3.90 M33 post, where I'm informed I need 3.52 M33-3.

I went through both posts again, looking for info on stepping up from 3.52 M33 to 3.52 M33-3 so I can make the final leap up to 3.90 M33. I swear I didn't find a thing, and I guess I'm not surprised, as right now, my brain is bleeding from a lethal intake of version-reading-itis and I can no longer discern number and letter combinations from complete jibberish.

I wonder if someone might be kind enough to direct me to:

3.52 M33 -> 3.52 M33-3 directions/information

I would humbly suggest that x3sphere's otherwise-excellent guide for 3.52 M33 be updated at the top to reflect an incremental tweak to M33-3 (or M33-4, as I've seen referenced).

Thanks much for your time.



Download the 3.52M33-4 (http://forums.exophase.com/showthread.php?t=3185) Patch.

Extract the archive, go into the PSP folder and the GAME150 folder untill you see a folder named M33Update4.

Copy the M33Update4 folder to ms0:/PSP/GAME150.
Execute the program and BOOM! you've got it:D

Now change the game folder kernel to 3.52 and proceed with the 3.90M33 update.

[aragorn56]

i need some help i tried installing 3.90 m33 but my psp says its already version 3.90 how do i get this to work im super confused any help would be much appreciated =)

p.s. i just bought it recently its stock version is 3.90 thats not a problem right?

[Acerthief]

i need some help i tried installing 3.90 m33 but my psp says its already version 3.90 how do i get this to work im super confused any help would be much appreciated =)

p.s. i just bought it recently its stock version is 3.90 thats not a problem right?


Start out with THIS (http://forums.exophase.com/showthread.php?t=6832) :p

[aragorn56]

which one should i look at i dont want to make any mistakes lol im new to this sry to ask stupid questions =)

[donsammy]

weird, i just updated from 3.71 to 3.90 and now my cso files wont play, they apear as currupt icons, i went back to 3.71 but still have same issue, any suggestion????

[x3sphere]

weird, i just updated from 3.71 to 3.90 and now my cso files wont play, they apear as currupt icons, i went back to 3.71 but still have same issue, any suggestion????

Has to be a memory stick issue then. I'd backup all data then format it via the PSP.

[donsammy]

Has to be a memory stick issue then. I'd backup all data then format it via the PSP.

ok, just format the MS on PSP, now i loaded my cso back ups and it wont read them on my psp MS.
no games found

[donsammy]

i see the games on ms when conected to puter but not on psp.
i am missing a setting, weird it was ok this morning it just stop

[x3sphere]

i see the games on ms when conected to puter but not on psp.
i am missing a setting, weird it was ok this morning it just stop

See if formatting flash1 via Recovery menu fixes it. And if that doesn't work try renaming the files to *.iso instead of *.cso.

[donsammy]

See if formatting flash1 via Recovery menu fixes it. And if that doesn't work try renaming the files to *.iso instead of *.cso.

i tried renaming the files and that dont work,
how do i do the format via flash 1 recovery???

[x3sphere]

i tried renaming the files and that dont work,
how do i do the format via flash 1 recovery???

If you go into Recovery mode by holding R while booting your PSP there's an option to format flash1 under the "Advanced" menu.

[donsammy]

If you go into Recovery mode by holding R while booting your PSP there's an option to format flash1 under the "Advanced" menu.

still no luck,

did the flash format, but MS doesnt read any games on psp.
any other sugestion???

[x3sphere]

still no luck,

did the flash format, but MS doesnt read any games on psp.
any other sugestion???

Can you try using a different MS?

[donsammy]

Can you try using a different MS?

i have tried on 2 diferent psp with 2 diferent ms, one says theres no games, on the other it reads the files as currupted

[donsammy]

what do you think if i do a msp format with pc???

gonna tried that one and see what happends

[x3sphere]

i have tried on 2 diferent psp with 2 diferent ms, one says theres no games, on the other it reads the files as currupted

Then my guess is that the CSO files you have somehow got corrupted and the PSP isn't reading them anymore. You'll have to redump the games.

[donsammy]

Then my guess is that the CSO files you have somehow got corrupted and the PSP isn't reading them anymore. You'll have to redump the games.

tahts weird, i was playing it last night, turn off psp and back on this morning and then it didnt want to read them any more
but ill rip my games again and try it, post back in a few

[sliver]

My fat PSP was upgraded with firmware 3.90 via the upgrade version in my PSP and now it won't able to detect any ISO/CSO formatted games in the memory stick. I've been searching for a thread within this website and found out that some of the features mentioned e.g. press SELECT key to enter the homebrew selection menu or cold starting PSP by holding R key, there's nothing happen.

Appreciate if anyone able to assist here. This is my nephew's PSP (6 years old) and I've promised him that it will be fixed by this weekend!

Need advices so badly here...

sliver
(newly joined crew)

[x3sphere]

My fat PSP was upgraded with firmware 3.90 via the upgrade version in my PSP and now it won't able to detect any ISO/CSO formatted games in the memory stick. I've been searching for a thread within this website and found out that some of the features mentioned e.g. press SELECT key to enter the homebrew selection menu or cold starting PSP by holding R key, there's nothing happen.

Appreciate if anyone able to assist here. This is my nephew's PSP (6 years old) and I've promised him that it will be fixed by this weekend!

Need advices so badly here...

sliver
(newly joined crew)

So what firmware are you running currently? Official firmware 3.90 cannot run ISO or CSO.

[andrewwan1980]

The big step from 3.40 OE-A was a downgrade back to 1.50 then back up to 3.52 M33-1.

Once we have 3.52M33-1 we needed to jump to 3.52M33-4, then 3.71 M33-1, then 3.71-4.

1. Will this always be the same pattern? We have to update to X.XXM33-1 then X.XXM33-Y where X.XX is some new version, and Y is any sub-version..?

x3sphere, I love your Install Guides since 3.40 OE-A. They have all been very short & easy.

2. What you do miss out is the confusion of the 1.50 kernel addon. Is this compulsory if we want to run homebrew in the GAME150 folder?

3. If I installed 3.71M33-1 then installed the 1.50 kernel addon. Then I install 3.71M33-4 (at a later date) will this override the 1.50 kernel addon?

[x3sphere]

1. Will this always be the same pattern? We have to update to X.XXM33-1 then X.XXM33-Y where X.XX is some new version, and Y is any sub-version..?

No, just for anything below 3.71 M33, as 3.52 M33-3 an onward fixed a bug in the upgrading process.

2. What you do miss out is the confusion of the 1.50 kernel addon. Is this compulsory if we want to run homebrew in the GAME150 folder?

Yes. Homebrew in GAME150 or any application based on the 1.5 kernel won't run unless it is installed.

3. If I installed 3.71M33-1 then installed the 1.50 kernel addon. Then I install 3.71M33-4 (at a later date) will this override the 1.50 kernel addon?

No, the 1.5 kernel addon will stay intact. Performing a major upgrade, i.e. 3.71 M33 to 3.90 M33 would erase the add-on, and you'd have to reinstall it in that case.