Play Black Ops, -dont sign in yet-, at the Main Menu click "Multiplayer"
At Multiplayer, Click "Xbox Live", It will ask you to sign in, choose your modded profile it should look something crazy like (^1[][][][][][][][] ) it all depends on how you customized your modded gamertags name.
It will ask you to select your avatar, just press the Xbox Guide button to close it, a notice may appear, press A to exit it.
Go down to Local -> Split-Screen. Turn on your SECOND controller and press "A" to sign in on it, although dont actually sign into a profile.
On your FIRST press "Join" and sign in onto your legit, non-modded gamertag that you want to play with. This gamertag must be the one you used to extract and create the modded gamertag. In other words, if I extracted EventfulPlum8's gamertag file, then I have to sign in and play with it.
Press B, go to "Xbox Live", it will connect to the servers... and CONGRATULATIONS! - you modded your gamertag.
One Controller Method
Play Black Ops, -dont sign in yet-, at the Main Menu click "Multiplayer"
At Multiplayer, click Local and sign into your modded gamertag, it will ask your to pick an Avatar just press the Xbox guide button.
You should get a notice, just press A and exit it, click Local -> System Link -> Create Match -> Start Match (Read next step before doing this)
When you start the match immediately sign out of your modded gamertag and into the legit gamertag you are going to use for online play. (This all should be done before the loading screen disappears)
You will be kicked out and will get an error, press A and exit.
Now press B, click "Xbox Live" -> Public Match.
MAGIC?
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