ok i got another theroy for mods what u will half to do is clear system cache and delete title update ok modd ur profile with gpd and put back on xbox but dont plug usb in yet then load up black opps with internet or wifi out then sighn in to ur like silver account or whateva then it will say update yes then update once updated it will say to press start if it takes u to multiplayer fine just go to main menu and sighnout of silver or gold account thats not modded click zombies and it will say sighn in put usb in xbox sense xbox is updated and usb isnt ur mods might still be on there idk if it sounds legit or works plz +rep if it sounds legit and also dont be a 8===D cause its a theroy hope it works sounds crazy but might work 8)