I too have encountered the same error recently. Not sure about the error code but mine came after attempting to go from 4.30 rogero v1.3 to 3.55 via the 999 downgrader. Mine got stuck on the install forever and would not finish so i ended up turning it off and i kept getting the corrupt data/need to format message. All I can say is I hope you FTP'd your saves and have all your backups backed up. I had to format it. Formatted mine on a pc first just to be sure. Took me about a week to fix everything back to the way it was but its good now. Im on Rebug 4.21 now. I dont know if it has something to do with downgrading with a large hard drive maybe? Just a theory. Best of luck to ya. Let me know if you find out something I couldn't
Originally Posted by hemtoni
As far as I know, my ps3 has never had an undetected error.