This is just a link to a list of people worldwide who are willing to help others by unbricking/downgrading your PSP via pandoras battery. This is no scam, (I'm on the list), just be smart people, and help someone else and don't charge other people for what you get for free!
DarkMessiah
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X...psp from some firmware to 2.81>3.03>1.50>3.40oa-e (thanks to PSPMod.com) -Fubared my MB trying to do an LED trigger mod - Still works, no screen
3.51>pandoras battery>1.50>3.40 oe-a