Thank you very much for the link.
Would you happen to know anything about the other issues i am having, or do you beleive that running the downgrader-->QA Toggle--> then install either rogero 4.30 or rebug 4.30will fix the problem.
update: I have tried to install rebug 999 downgrader and i still get corrupt data. My thoughts are this: is it possible because the system did an update while trying to do a game update for fifa 13, that the system still believes that the game is "loaded" (same as if the disc was in the drive) and therefore when i try to update it gives me a corrupt data message. If this is possible then how can i "eject the game" or make it realiase that there is no game loaded.
thanks for your help