Depending on the
PSP Model 1000-2000 you can downgrade your
PSP using Custom firmware by forming a
MMS using
RainsUltralite and a Pandora's battery. Custom firmware equivalent to the official firmware can be determined by the games played. Most recent games require updated firmware. This site should help you with all the software
necessary to downgrade or modify your
PSP.
http://pspslimhacks.com/rains-ultralite-mms-maker-for-500-m33-4/
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