Well, I kinda fucked up. So, here's my story: I downloaded a FF IV Complete Collection ISO that was freezing on cutscenes, but I could make through it by loading the game and getting there again, and for some reason it wouldn't freeze this time. The cutscenes usually happened after I saved, so I didn't care that much. But then I got to a cutscene after 2 boss fights, and... it froze. I googled about it and found a simple tutorial that people claimed that would help: patching the ISO twice with Prometheus, once on ME631 and then on 05. I did it. Then I tried playing the game, and it claimed the save file was corrupted. I deleted the ISO and downloaded another one and tried playing it, but it claimed there was no save data. I found out my old ISO was european (it had the code ULES01521), while the new one is US (ULUS10560), so that's why. Basically, here's 3 questions: 1) If I follow that tutorial to uncorrupt save datas caused by firmware upgrades, will it work in this case? 2) If I download the european ISO again, will I be able to load my save data? 2) How do I stop the freezing without being unable to load my save data? I'm running a PSP 2000 on 5.50 Prometheus-4. Thank you for your time.