With High level account, Press A On System link, then create a game With the lower level account, sign in, and then right away sign out. With the player 2 controller, press A to sign in With the high level account, press B to sign out With the player 2 controller, sign into the high level account With the player 1 controller, sign into the lower level account You should now be at the Multiplayer menu. With the high level account [Player 2 controller], Press A On System link, and then create a game With the lower level account, then sign out straight away With the lower level account, press A to sign back in With the higher level account, (Player 2 controller) press B to sign out Now just switch the High Level account back to Controller 1, And the Low level account back to Controller 2. Press Start and the low level account (Player 2 controller) will glitch out and be the same level as the high level account Back Out To The Multiplayer Menu, As Soon As You Have Completed Step 13. Sign Out Of The Player 1 Controller (High Level), Then Go To Xbox Live With Your Player 2 Controller. Search For A Game. Once You Have Started Any Game, You Can Either Play It Or Back Out And The Rank Will Stick Forever. Sign-in the higher level account on controllers 2 and click on xbox live to enter the lobby then hit B. With controllers 1, go down to options on the multiplayer menu and hit A. Press B on controllers 2 and sign-in the lower level account and press A on controllers 1 and sign into the higher level account and hit Start. Now you sign out of controllers 1 and with controllers 2, clickxbox live Now join a game and kill yourself to stick it!
Both methods are patched until further notice.