Alright, so I downloaded and tried out the 6.39 PRO-B8 CFW, downloaded a few .ISOs and a few .CSOs, installed the thing on my PSP model 2001, and everything ran perfectly. I played for about an hour, then exited the game, and turned the PSP off. When I came back, I tried to play again, and got the 'The Game Could Not Be Started (80020148)' error. I didn't change anything... And now none of the .ISO or .CSO files work... What the heck happened and how do I fix it so it never happens again?