This is not reversable without a pandora battery and a magic memory stick, the pandora battery is a modified battery that lets your psp boot from a special memory stick (magic memory stick) into service mode, from there you're able to reflash your psp to a custom firmware, this needs also to be on that memory stick, since your not able to use USB or Wifi in the service mode.
You've flashed your psp with official Sony
firmware, this lets you play only games that are bought from PSN and does also only run games
from UMD.
Succes.
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