What you need:
Transfer Cable or USB
2 Xbox Controllers

Steps:
Make a Copy of your banned profile on your computer
Open the second copy of your profile into horizon and change the profile ID to:
--E0000D1DD702EA8E--

Put that profile back into your HDD or USB and turn on your Xbox
Now go onto Black Ops and select Multiplayer

*****MAKE SURE YOU ARE SIGNED INTO YOUR NON-BANNED ACCOUNT

Second Controller:

1) Sign onto your Banned profile on your Second Controller

2) Hover over your Banned Account

3) Back Out

4) Go to Local>Splitscreen

5) Click the Y Button and go over to "xbox live party"

---------MAKE SURE YOU IN A PARTY CHAT--------

6) Click combat record

7) Press the "b" button

It will take you to your playercard

9) Hover over the "prestige mode" ----------You do not need to be level 50---------

10) Join your friend's session on your non banned account.

****It will transfer your banned account with you