Hacking Change ally code on Modern Warfare 3?

[gbasource]

My bros save file got corrupted when his wii froze. I extracted my prestige 4 level 47 save file for him and then he installed it onto his wii with save game manager. Unfortunately the ally code on his save file stayed the same as mine and now both of us cannot be online on the save file at the same time. The trouble lies with the ally code. Is there any way to change the ally code in the save file or on the wii so that I can have a different ally code but the same save data. i do not want to start all over. We both have savegamemanager.