Things You'll Need
Instructions
Turn off your Sony PSP and remove the normal battery and memory stick from their respective ports. Place them aside.
Insert your Magic memory stick into the PSP card reader. Insert your Pandora battery tool into the PSP, and your PSP will turn on automatically. The PSP is now in service mode.
Press the "X" button twice to restore the PSP firmware to the original PSP firmware, 1.50. Wait as the PSP is downgraded, reinstalling/fixing the corrupted files of the PSP firmware.
Press "X" again when the program tells you to. This will shutdown the PSP. Remove the battery and memory stick, and replace them with the normal ones. Turn your PSP back on.
Navigate to the "System Update" icon on the PSP and select it to update your PSP firmware to the latest release by Sony.