I have both Sonic Rivals 1 and 2 and i bet both games 100% and unlocked all costumes but it took me a lot of work, about 2 months ago i updated the firmware of my PSP without knowing about the save issues, now some game can't load the save files anymore and instead it gives me "corrupted file" message, i have backed them up some time ago but still same problem, i tried goggling other save files but nothing worked except one for Sonic Rivals but it's 30% finished, i was hoping of someone can help me, thank you!