Theres a "brute force" way to do it. And once you get it, its very easy:
Heres the theory:
Click on the family settings, and it will pop the code screen. But if you press the guide button FAST it will not show the code screen. Now, you press the guide button again to dismiss the mini blades and again FAST you press down and the FASTly press the guide button again.
If done right you can navigate the settings and just turn it off.
Heres a video to explain it better:
http://www.youtube.com/watch?feature=player_embedded&v=rzNH2WxX56Q
Its portuguese, made by the guy that told me of this method.
Skip to 0:50 to see the method in action.
Good Luck
