As you may know once you are banned from Xbox live if you use that banned console to play games and then put your hard drive back into an unbanned console your profile shows as corrupted and you have to recover Gamertag from Xbox Live. In doing this though you lose any achievements you may have obtained on the banned box. I have found a way to un-corrupt the profile without Recovering.
What you need:
A Data Transfer Cable for Xbox 360 or disassemble your hard drive.
CON Flag...