Things You'll Need
Instructions
Turn the PSP off and remove the battery and memory stick from the device. Place these to the side.
Insert the Magic memory stick into the PSP memory card slot. Place the Pandora battery into the PSP. The PSP will turn on by itself and will be in service mode.
Press the "X" button once to reinstall the PSP firmware, which includes the system files. Press the "X" button once more to shut down the PSP.
Reinsert the normal battery and memory stick and turn your PSP back on. The PSP will boot up with its system files restored.