My friend had custom firmware on his PSP [he's a noob, I put it on there for him], all fine, and then one day he bought a game, and he upgraded his CFW PSP to OFW. I put custom firmware back on, and I think the UMD somehow messed up his ISO and GAME folder [as described in CFW folder blocker]. I cannot see any of the homebrews and games he had, and tried various method of trying to get it to show up.
* Used Windows's built-in check disk
* Formatted Memory Stick
* Copying a fresh copy of the game
Still nothing. Please help!