Theres an easier way this is how i did it i simply un plugged the ethernet cord from the back or if your using wireless disconnect the little thing then sign in ( remember the ethernet cord is UNPLUGGED so you wont connect to xbox live!!) then start it up normally and get in the glitch now when you get to the round you want press start, plug the cord back in, connect to xbox live and then your round will be saved to the leaderboards!