Specifically Mortal Kombat BLUS-30522.............The game functioned fine and then after installing the 4.20 spoof I tried to see what games worked online and accepted the updates.........afterwards the game no longer works so I went into game data on xmb and there is no update there. I then went on my external hdd and looked in the GAMES folder and found the folder, but the update folder is empty..........also, the param SFO is still written to 3.55...........so, where did the update go so I can delete it? Perhaps, I need to edit the param to revert to an earlier update? Thanks in advance.