Hi, i juz purchased my PSP Slim not too long ago. Had it done up with 3.71 m33-2 upon purchase. The shopowner also preloaded some games for me to try. All the games appeared under an "ISO" folder. I could play the preloaded games smoothly. But when I downloaded a game file myself and attempted to upload it into my PSP, I placed it under my "GAME" folder and it showed up on my PSP as "corrupted". How should i rectify the problem? Appreciate the help and sorry for any trouble cuz I'm pretty new.