Downgrading Custom Firmware (OE / M33)

[x3sphere]

Note: This guide is for use with regular PSP units only, the following steps are not to be performed on a PSP Slim.

Want to go back to a previous OE revision or have decided that custom firmware is not for you? Here is how to downgrade your new custom firmware installation in five easy steps.

Recovery ZIP for Custom Firmware 2.71 - 3.52 (http://forums.exophase.com/attachment.php?attachmentid=75&d=1174070787)
Recovery ZIP for Custom Firmware 3.71 (http://forums.exophase.com/attachment.php?attachmentid=3742&stc=1&d=1193276795)

It's important that you download the recovery ZIP corresponding to your firmware version.


Extract the Recovery ZIP.
Place the "RECOVERY" or "UPDATE" folder in X:/PSP/GAME/
Download the 1.5 Update (http://exophase.com/files/psp/150.PBP), save as file name "UPDATE.PBP"
Move "UPDATE.PBP" into the same folder you placed on your memory stick in Step 1.

If you are running custom firmware 2.71 - 3.52
Everything is setup! Hold R while turning on your PSP to enter recovery mode, and choose the option which reads "Run program at.." to begin downgrading to firmware 1.5.

If you are running custom firmware 3.71
Navigate to the Game menu and launch "Update to X.Y.Z." You may be asked to patch your idstorage keys, if so, press X.

[scaveman]

Thanks Guys

Now i have best of both worlds!!!!!!!!!

[roe-ur-boat]

You can also just run a different oe update and it will work fine. You can't run the 1.50 update though.

[themlody]

Can you do the same thing on the normal sony 3.30?

[Darkchild]

Can you do the same thing on the normal sony 3.30?

not really. No downgrader T'ill this day has been found for that version yet

[Ichigo04291982]

Thanks, but how comes when i went it my games folder it said Corrupted Data please help me.

[x3sphere]

Thanks, but how comes when i went it my games folder it said Corrupted Data please help me.

erm, your not supposed to run it from the PSP game menu. You have to run it from recovery..

[pnunes]

I have 3.40OE and want to go back to 3.10OE...

how to do that???

Need to go to 1.50 and then to 3.10oe, or just do the normal instalation of 3.10oe on my 3.40OE PSP??

regards
PN

[roe-ur-boat]

I have 3.40OE and want to go back to 3.10OE...

how to do that???

Need to go to 1.50 and then to 3.10oe, or just do the normal instalation of 3.10oe on my 3.40OE PSP??

regards
PN
just run the normal installation over it

[ryo-n-gats]

Ok, I have always used the method presented in the first post, but one of my friends (he had 3.03 OE) simply created a folder RECOVERY in PSP/GAME and put 1.50 update (named as EBOOT.PBP) and run the recovery from the recovery mod, and it worked. I am totally confused?! How the hell is that possible?

btw when PSP booted in 1.50 it just said "Contact sony computer entertainment technical support line for assistance", and simply entered XMB.

Now my question is, how is that on earth possible to do without the files provided in Flasher for recovery folder?

[x3sphere]

Ok, I have always used the method presented in the first post, but one of my friends (he had 3.03 OE) simply created a folder RECOVERY in PSP/GAME and put 1.50 update (named as EBOOT.PBP) and run the recovery from the recovery mod, and it worked. I am totally confused?! How the hell is that possible?

btw when PSP booted in 1.50 it just said "Contact sony computer entertainment technical support line for assistance", and simply entered XMB.

Now my question is, how is that on earth possible to do without the files provided in Flasher for recovery folder?

well it might be possible on 3.03 OE (can't remember) but it definitely doesn't work on any recent OE revisions.

anyways the recovery folder is a better solution since people who are recovering from bad XMB or font flashes wouldn't be able to run the Sony updater as it loads vsh modules.

[ryo-n-gats]

well it might be possible on 3.03 OE (can't remember) but it definitely doesn't work on any recent OE revisions.
Ok, thanks for clearing that up for me. ;)
anyways the recovery folder is a better solution since people who are recovering from bad XMB or font flashes wouldn't be able to run the Sony updater as it loads vsh modules.
One thing more, does it mean that people have already tried to downgrade OE to 1.50 without standarad procedure? (because i saw it first and only time when my friend did it, I'm just interested did somebody suceed too)

[x3sphere]

Ok, thanks for clearing that up for me. ;)

One thing more, does it mean that people have already tried to downgrade OE to 1.50 without standarad procedure? (because i saw it first and only time when my friend did it, I'm just interested did somebody suceed too)

nah, this is the first time I've heard of someone just using the official Sony eboot. although I'm sure others have tried it.

[avivp12]

i want to go back from 3.40OE-A to 1.50 and i did what that they said and the psp turned off.
and when i want to play games, the psp is loading and then shutting down...
what can i do?!?!
please help me!:sad:

[x3sphere]

i want to go back from 3.40OE-A to 1.50 and i did what that they said and the psp turned off.
and when i want to play games, the psp is loading and then shutting down...
what can i do?!?!
please help me!:sad:

what's in your recovery folder?

it should contain these files..

decryptprx.prx
EBOOT.PBP
extprxs.pbp
libpsardumper.prx
UPDATE.PBP

[avivp12]

dude look some of the games working and some of them do working, and i want to stay on this fw.
now why does some of the games like Burnout Dominator and others aren't working?

[avivp12]

now dude i want to downgrade back to 1.50 can you send me a link file for those files?

[roe-ur-boat]

Heres the recovery files here just put the 1.50 update in it and rename it to UPDATE.pbp then put it in the GAME folder then run them from recovery mode.

[avivp12]

ok thanx, and now another quastion, why does games sometimes dont work?

[x3sphere]

ok thanx, and now another quastion, why does games sometimes dont work?

have you tried disabling NO-UMD in recovery mode? also this isn't really the proper place to ask this.. should've made a thread in the help center.

[Alphenz]

Want to go back to a previous OE revision or have decided that custom firmware is not for you? Here is how to downgrade your new OE installation in five easy steps:


Download the Recovery folder (http://forums.exophase.com/attachment.php?attachmentid=75&d=1174070787)
Place the Recovery folder in <pspdrive>:/PSP/GAME/
Download the 1.5 Update (http://72.29.74.204/~exophase/external/150.PBP), save as file name "UPDATE.PBP"
Move "UPDATE.PBP" into the Recovery folder you placed on your memory stick in Step 1
Everything is setup! Hold R while turning on your PSP to enter recovery mode, and choose the option which reads "Run program at.." to begin downgrading to firmware 1.5.

I was told we can now downgrade ver. 3.01 to 1.50. Is this the way to do it? Thank you.

[Jaynb]

I was told we can now downgrade ver. 3.01 to 1.50. Is this the way to do it? Thank you.

Hi,

These instructions are for downgrading from an OE firmware not an official sony firmware.

If you are on 3.01 then you will need to follow the guide in this thread. (http://forums.exophase.com/showthread.php?t=525)

But in order for you to do this, you will firstly need to upgrade to sony official 3.03 (http://files.exophase.com/psp/EBOOT_303.zip), and have an unpatched copy of "Grand Theft Auto - Liberty City Stories".

[Alphenz]

Great! Will follow your lead and hope for the best. Thank you again.

[Jaynb]

Great! Will follow your lead and hope for the best. Thank you again.

Not a problem. Happy to help! :smile:

[Fisayo26]

I wanted to know if a sony firmware 3.11 exists for the PSP. If so is there a way to downgrade it to 1.50.

[roe-ur-boat]

I wanted to know if a sony firmware 3.11 exists for the PSP. If so is there a way to downgrade it to 1.50.
Yes it does exist and no it can't be downgraded.

[shadowthor]

If you just got the psp, see if you can trade it for a psp with a firmware lower than 3.03.

[King-Wade]

sweet tutorial x3sphere, i downgraded just to see if it worked and it worked perfectly, of course i upgraded back up right away but this is definitely going in my bookmarks:D

[Cheezeball99]

Welcome to the forums, King-Wade!:smile:

[King-Wade]

thnx alott:D but uhmm anyways i tried downgrading again but when i ran the update file my screen went black and then turned off..and now thats whats happening when i run iso/cso files..andy ideas?

[roe-ur-boat]

Check all your settings in configuration in recovery mode. See if any are different and change them to whatever you want.

[King-Wade]

but how would i know if they are diffirent?? i didnt really pay attention to what it was...

[roe-ur-boat]

well firstly check that no-umd is disabled and you have a umd in the drive

[King-Wade]

well firstly check that no-umd is disabled and you have a umd in the drive

okay...no-umd is disabled and i have a umd in the drive..and still same problem:sad:

[Cheezeball99]

Try downgrading again, to 1.5 (unless it already did) and then to back to the OE.

[King-Wade]

i did try though and it still didnt work

[x3sphere]

try clearing your flash1 config: http://forums.exophase.com/showthread.php?t=1830

[roe-ur-boat]

Maybe this will teach you not to mess with flashing. :smile:

[King-Wade]

thanx alott that worked:D and uhmm i dotn ill ever, ever, EVER mess with flashing again

[fixxer406]

im trying to downgrade but when i load the downgrade i just get a black screen... is it possible my psp is " bricked " and what does bricked mean

[roe-ur-boat]

bricking you psp means that you just get black screen when you turn it on and what firmware were you downgrading from

[dennis96411]

Hey,yesterday I downgraded my friend's PSP from 3.50 to 1.50 and then upgraded to 3.40 OE-A,and now he say he can't play any UMD games,he got the messege:The game cannot be started.So he tell me to get back the way it was before,so I guess I have to downgrade and then install 3.50 on his PSP again.But will it brick?
His PSP
3.50>>1.50>>3.40 OE-A
Will it brick if he downgrade to 1.50 and then upgrade to sony's again?
I heard someone said that if you downgraded to 1.50,you cannot upgrade to sony officials again.
Is it true?Will it brick?Someone please tell me!!!!!!!!

[roe-ur-boat]

If you go back you will not be able toupgrade again to anything. Disable all te options in advancd in recoveryt mode and it should fix his psp

[King-Wade]

can this be used to downgrade M33 as well?

[x3sphere]

can this be used to downgrade M33 as well?

should work, but I can't say for sure.

what do you want to downgrade to? You CAN install OE right from M33.

[Acerthief]

i dunno if other people have this problem. after downgrading to 1.5 and the blue screen of death, it reboots itself. but if you have a UMD inside, it auto starts the UMD, just skipping the xmb. and OMG it auto updates to the firmware you have from the UMD (in my case it's a 2.71[whew] scarface.) then i have to downgrade back again to 1.5, wasting a HELL lot of time.

[Cheezeball99]

Heh, wow, that would suck... Downgrade to 1.5... Reboot, BSoD, 3.51'd :p

[Acerthief]

what's BSoD by the way :P

[x3sphere]

em, that seems odd. Sony firmware updates don't auto update... you actually have to scroll through a couple of prompts before starting the update.

[Acerthief]

i've realized that. but anyways i'm back to my 3.51M33 there will be no problem.

[Cheezeball99]

what's BSoD by the way :P

Blue
Screen
of
Death

[Acerthief]

oh, thanks cheezeball.

btw, x3. this guide supports M33, so i guess the name of the guide should be "Downgrading OE/M33"? a few of them PMed me asking if this works on M33.
i would have change it but that's when i found out i wasn't a moderator of this section.:(

[x3sphere]

oh, thanks cheezeball.

btw, x3. this guide supports M33, so i guess the name of the guide should be "Downgrading OE/M33"? a few of them PMed me asking if this works on M33.
i would have change it but that's when i found out i wasn't a moderator of this section.:(

Okay. I wasn't sure if it worked on M33 or not.

[Acerthief]

Okay. I wasn't sure if it worked on M33 or not.

lol no problem
it worked on mine 3.51M33 and 3.52M33 so i guess it works well.

[kaco]

Hi, i read and read , but i want to make sure, its true that's theres no way to downgrade the 3.30 ?
thanks

[Cheezeball99]

Hi, i read and read , but i want to make sure, its true that's theres no way to downgrade the 3.30 ?
thanks

Actually there is now, there is two ways, you can either update to 3.50 (NOT NOT NOT!!! 3.51 OR 3.52, or you can't use this one) and use the 3.50 downgrader which uses the Lumines UMD, you can find a guide to do that HERE (http://forums.exophase.com/showthread.php?t=2470). Or, on the other hand, you can use the Pandora Battery, but that's only an option if you have a friend with homebrew. Guide for that can be found HERE (http://forums.exophase.com/showthread.php?t=3238).

[Syrre]

ooook ... now ... correct me if im totally wrong here .... but let´s say i buy a psp today, get it with new firmware, then i can use this to downgrade to 1.5 and install M33´s newest ... then if i want to i can downgrade to 1.5 again, and then install one of sony´s newest ? .... or will that cause a "brick" ? ...

and if i install M33´s newest from 1.5 will i be able to run everything, or do i have to install M33´s from a newer sony version ?


(been reading alot of topics here, but the more i read, the more confused i get .... so what im saying is, any help would be greatly appreciated)

[Acerthief]

Well now, we use "Pandora Battery" to downgrade our firmware back to 1.5. But you'll need some one with a customfirmware to convert your battery.

Or you can:

If you have 3.50(NOT 3.51 or 3.52), use the 3.50 downgrade guide with a copy of Lumines.
If you have 2.81-3.03, upgrade to 3.03 and downgrade with a copy of unpated GTA:LCS.
For 2.80, use the 2.80 downgrade guide.
For 1.51-2.71 use the 2.71 downgrade guide.

After you're on 1.5, upgrade to M33 directly, you don't need it from a newer sony version.

After you're on M33(or any custom firware), you can revert back to any firmware(both custom and official you pleasure). Chance are bricking (means a bad upgrade or downgrade, you psp can't even boot, only the power light is on) is VERY little if you follow the guide slowly step by step. :).
hope it helps.
If you have futher questions, feel free to post in the PSP Help Center.

[Syrre]

hmmm ... someone to convert my battery you say ? .... hmmm ... dont really know anyone else with a psp, so i cant up and downgrade then ? .... sry for all the questions guys (and girls ofc) but i was out like 5 minutes ago and bought me a psp =P, so i really want to know all the noob Q´s and A´s asap ... hehe ..... pandora you say ?, ill be reading some more if anyone wants to "haul"

[Acerthief]

check your firmware first. Settings -> Sysytem Settings -> System Information on your psp.
letss see what you have first.

[Syrre]

i have version 3.60

[Acerthief]

so you bought psp Slim?
then these downgrade guides don't work now, as the new PSP just came to stock.

[Syrre]

ah =/ ... ok .... thats too bad =/, really wanted to try M33´s out =/ .... but if i cant downgrade then its too much of a risk i guess

[Acerthief]

well there's 3.60M33 now, but some homebrew using 1.5 kernel will not work. take a look HERE

[Syrre]

hmmm .... but i still need one more psp (phat) to get that pandora stuff .... and since i dont know anyone with a psp, i guess i´ll have to wait =/ ..... hmmm ..... how come i have to do something with the battery btw ?

[Acerthief]

it writes stuff into it making the battery boot from the memory stick and all that downgrading stuff

[Syrre]

hmmm ... ok ... so there´s no other workaround ?

[Acerthief]

well there's 3.60M33 for PSP slim now, but most homebrews aren't working.
Check out the installation guide in "PSP FAQ and Guides" section. :D

[Syrre]

will do =P ... hehe .... just one more question .... i just ordered the "lumines" game .... so uhm .... that wont work on the slim ?

[Acerthief]

nope. it's for 3.50 downgrade on Older PSPes

But relax, its a fun game!

[Syrre]

hmmmm ok .... just got a site with the MAX powertool battery, will that work for psp lite btw ? =P .... cause if it did i could install a custom firmware and then downgrade right ?

[Acerthief]

no idea on that. i don't have a slim yet therefore i can't tell you the answer. but maybe our x3 the man can give you the answer :D

[TimTiger]

hmmmm ok .... just got a site with the MAX powertool battery, will that work for psp lite btw ? =P .... cause if it did i could install a custom firmware and then downgrade right ?

The TOOL battery will put you into service mode, all you need is the memory stick with the Despertar del Cementerio files on it and all should work.

[anbu_blurr]

My PSP currently running on version 3.72. Please show me some guide/tutorial to downgrade this 3.72 version to 1.50 version.

I'm downgrading my PSP for upgrade it later to version 3.40 OE. Thank you.

[Acerthief]

My PSP currently running on version 3.72. Please show me some guide/tutorial to downgrade this 3.72 version to 1.50 version.

I'm downgrading my PSP for upgrade it later to version 3.40 OE. Thank you.

You can't use downgraders here BTW.
The only way now is to use "Pandora Battery" and "Magic Memory Stick" (http://forums.exophase.com/showthread.php?t=3780).
Note that you'll need a phat PSP battery to do the job.

[Adam10]

Hi guys, very interesting threads. I have a problem in that my PSP is about 3 years old and had originaly a version 2 firmware which I downgraded to 1.5 and used devhook with it. I now want to restore it to a normal PSP, but when I go to play a store bought game it tells me to upgrade, which I try to do but not a lot happens in the upgrade screen, any ideas?

[x3sphere]

Hi guys, very interesting threads. I have a problem in that my PSP is about 3 years old and had originaly a version 2 firmware which I downgraded to 1.5 and used devhook with it. I now want to restore it to a normal PSP, but when I go to play a store bought game it tells me to upgrade, which I try to do but not a lot happens in the upgrade screen, any ideas?

Are you trying to run the game from within DevHook? If so... don't do that, just run it directly from the 1.5 firmware.

[bochenghu]

Sorry for the noob question ya'all~ but recently my brother upgraded his PSP 3.51 OE to a 3.80 M33-5 and won't cha know it, most of his games won't run. He's totally glued to samurai warriors and the bloody thing just won't run on the 3.80.

So this is what I am planning to do after reading through the forum:
1. DL the 3.51OE update from the Godly Dark Alex website
2. Copy the extracted files to X:\PSP\GAME
3. DL the 351.PBP file and move it into the same folder
4. Boot up the PSP, browse to the update and just run it...

Am I on the road to damnation or am I on the right track

[Acerthief]

Sorry for the noob question ya'all~ but recently my brother upgraded his PSP 3.51 OE to a 3.80 M33-5 and won't cha know it, most of his games won't run. He's totally glued to samurai warriors and the bloody thing just won't run on the 3.80.

So this is what I am planning to do after reading through the forum:
1. DL the 3.51OE update from the Godly Dark Alex website
2. Copy the extracted files to X:\PSP\GAME
3. DL the 351.PBP file and move it into the same folder
4. Boot up the PSP, browse to the update and just run it...

Am I on the road to damnation or am I on the right track


Better yet, I think you should go to 3.52M33 (http://forums.exophase.com/showthread.php?t=2732) FIRST. Then update the 3.52M33-4 (http://forums.exophase.com/showthread.php?t=3185) patch.
After that, when in the XMB, Press home and a menu should show up in middle of the screen. Choose the "UMD Mode" to "Sony NP9660". After that try the games and see if it works.

[bochenghu]

Thank ye kindly AcerTheif for your lightspeed response. Will try it out and will update all later. Thanks.

[bochenghu]

Hmmm... it didn't quite work. Sorry to repost but here's my problem again:

I have a PSP phat running 3.80 M33-5. I need to downgrade it to a 3.71M33.

I downloaded the official 371.PBP and the 3.71M33 Installer and put both into the X:/PSP/GAME drive and tried to run the program in my PSP. It won't work.....

Hope ya'all can help me out with some guides cause I tried everything I can suck out from this forum but there's just no definitive guide available to guide me through this.

Thanks all

[Acerthief]

Hmmm... it didn't quite work. Sorry to repost but here's my problem again:

I have a PSP phat running 3.80 M33-5. I need to downgrade it to a 3.71M33.

I downloaded the official 371.PBP and the 3.71M33 Installer and put both into the X:/PSP/GAME drive and tried to run the program in my PSP. It won't work.....

Hope ya'all can help me out with some guides cause I tried everything I can suck out from this forum but there's just no definitive guide available to guide me through this.

Thanks all


For now 3.80M33 and 3.90M33 can't be downgraded.
(Some one should update this though)

Anyways installing directly won't work, as the newer installers (3.71M33 and after) and more similar to what Sony has, detects the firmware and blocks you if you have firmware later than the one you are installing.

So all we can do is wait...
(So am I :()

[bochenghu]

Ah hah. So that explains it..... SOB! But thanks anyway for the s'plain. Quick work AcerTheif. Always on ya toes it seems.

Was gonna try to use the pandora thingie but..... errrmmm..... frankly speaking, it scares the cr@p outta me. I'm not one of the most tech savvy people around.

[ayie69]

urmm..i am using cfw 3.40 oe-a,i have done everythng you said..but when i open the recovery and execute the run program at...it runs but it will just leave blank black screen and it will turn off automatically..why..??

[Acerthief]

urmm..i am using cfw 3.40 oe-a,i have done everythng you said..but when i open the recovery and execute the run program at...it runs but it will just leave blank black screen and it will turn off automatically..why..??

Set the kernel to 3.40, and double check if everything is in the correct place. Try again.

[ayie69]

Set the kernel to 3.40, and double check if everything is in the correct place. Try again.
but i have set the kernel to 3.40 and what do you mean by in the correct place..i changed the vsh things inside like the battery,the xmb and all...ihave the backup of the original ones but my comp reformatted and everything's gone..is it because of the xmb change..?

[Acerthief]

but i have set the kernel to 3.40 and what do you mean by in the correct place..i changed the vsh things inside like the battery,the xmb and all...ihave the backup of the original ones but my comp reformatted and everything's gone..is it because of the xmb change..?


I'd dunno, but could be possible.

Why do you need to downgrade? (Just curious)

You could try going up to 3.52M33 first then downgrade.

[ZiNoM]

Very nice thing. I updated my brother's PSP and he don't know. when he saw it have ordered that i put it again in the old version only to bore me and that tool/guide is very usefull!!!
Thanks!! :p