Once your account has been permanently banned, there's no way to unban yourself. The best thing to do is make a new account and use an Anti-Ban EBOOT to prevent any more bans.
There's no ban bypass and never will be, just use a anti ban and don't edit your stats like crazy and you'll be fine
I just got banned... never played bo2 in my life before... i installed it... i didnt even use a cheat/mod or anything... i go online... i reached level 5 my KD was 0.22 and i got banned...lol...dunno why... but your stats propably dont matter...im wondering why they banned my account...wondering if they see im using cfw on a jb console