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It comes from eating alot of brains.... Mmmm zombies ;)
All you need to do is on your custom firmware enabled PSP run the DC6 file with the proper .pbp files at the root of your MS that you turned into a magic stick and then your ready to do slims and phats. no need to change your battery or...
My opinion is that it's sony trying to take advantage that there is no new M33 firmware as of yet. Basically put out a title that people would want to play and force them to upgrade to play it.