really??? why? my psp is hacked right, so i put on the emulaters and put the gams on, and ta'dah, it works. only some are able to work on officail firmware. if it keeps jamming, its either to do with ur psp (i doubt it) or ur memory stick (MUCH MORE LIKELY). the bigger it is the more likelyness of being corrupted easily. for example, i got a really secure memory stick, but it was 16gig, so it got ocrrupted. thats why i always buy 2-4gig memory sticks now. but if its with ur psp, ipdate ur firmware.