I was playing GodEater on the UMD, I had finished most of the download quests, I heard there was finally a patch for GodEater, I switched to CFW 5.5 GEN-D2. The game works on CFW, thanks to the brilliant hackers online, however, my save file was corrupted when I tried to load the game. I [...]

I think I managed to borke this update. Well anyway, for the rest of you folks, it’s already out since 28 April 2010.
I’ve tried numerous methods to get it working on CFW, including:

Downloading with PSP Media Go, then transferring to PSP. (Tells me that the PSP is already activated with a different id)
usbversionfake (Doesn’t allow [...]