Originally Posted by amiroray
was u running mw3 off disc before bdvd broke? that error is usually to do with improper keys used to sign the eboot. for example a 3.55 signed eboot will not work on 4.30 cfw. u could try installing all the updates for the game. also to run the game externally u need to press square in mm then bubble in external and bd-mirror.
Well, why do my 3.55 signed games work on 4.30?
My solution : try deleting the latest installed patch in gamedata.