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Heres a simple tutorial:
1. Convince your friend to either let you do the glitch (A), or they could do it them self. (B) [This is best done around 6:00 EST]
2A. Perform the following glitch (Instructions in description)
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2B. Link the player to the following video, but tell them that it can be done quicker if you start the glitch, get 1 kill then leave the game.
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3A. Get one kill and then leave the game. Keep the account signed in until the contracts reset (see below)
3B. Tell them to send you a message once they've left the game and tell him/her NOT to go to player match UNTIL the contracts update (Check this thread:
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4. THE PLAYER WILL NOW BE RESET TO LEVEL 1!
How this works: As many people have noticed, you MUST do the glitch in one match or else you have to do it all over again. What alot of people dont know is that if you leave halfway, your account will stay on whatever level you made it to on LAN. So if they enter the match, get 1 kill then leave... they will obviously be at level 1. (I learned this the hard way)
NOT PATCHED AS OF 30/12/2010
Credit: olboijoe for the cool vid

, CheDaremas1 for the contract update time