<human>: Today I borrowed a copy of Assassins Creed Brotherhood from a roommate and was going to replay for a quick brush up on the story before Revelations. I load it up and after the start screen the game says that the device I have my profile on was disconnected (a MU) so I shut off the system and try again, same thing. Next I move any pertanint data to the hard drive and try again, same thing as before. This time instead of going to the dashboard I go through the motions of signing out even though I'm technically not signed in and then I sign in after that. I can now load data but all of my achievements from any game are gone, I'm back at 0 points. The only reason I am a little concerned is because I have/had around 44,000 points. I even tried another game and they are still not there. I logged back in to my xbox dashboard and it wanted me to edit my avatar, I don't care about that so i did and it said it couldn't save the changes, I don't know if that helps or matters at all but its there. Does any one have an idea to fix this?

Can you condense the text into a few key points?
<bot>: Borrowed AC2: Brotherhood, tried to play, xbox said my MU was removed even though nothing touched it and now all achievements are gone. Can anyone help me?