QUOTE(Mik3h @ May 31 2011, 02:26 PM)

That makes no sense, firmware info is sent to MS each time you log into LIVE. This is why there have been countless revisions of iXtreme and why LT is still thought to be undetectable. If it's undetectable, there's no need to flash back to stock, and if you think MS can detect it, then they've already been doing it when you sign into LIVE.
DVD ROM firmware is NOT checked when you're connecting to LIVE! Never was!
Do you think each time you log in into live Console puts DVD ROM into a firmware readable mode, reads the firmware, checks it, sends results to MS? I can image what would be Xbox boot time if it's true

Correct me if I'm wrong, but only during the launch of the game console makes checks. And it has nothing to do with logging into LIVE.
And you're mixing two different things: DVDROM response when backup is inserted and game launched vs. read of the firmware and comparing it to original which is supposed to be installed.
Dash update process is something different. And during the Dash update - I don't see any problems why MS couldn't read the FW and take some actions.