As far as a I know no bios update cares about the OS. since its all 'pre-os' agnostic.
If some MB manufacturer did make some update for an OS, say something to do with drive reading, or bug exposed from newer OS. Id wager that it shouldn't break other OSs. that would be bad practice and a shitstorm waiting to happen on open tickets.
I COULD be wrong and it something new now a days, but I've never seen a bios update fubar usage on any special OS in all the time I've dealt with computers. (i've seen bios updates break booting at all, even to post..but those was bad updates, no anything to do with the OS on it.)
-We don't control what happens to us in life, but we control how we respond to what happens in life.
-Hard times create strong men, strong men create good times, good times create weak men, and weak men create hard times. -G. Michael Hopf
Disclaimer: Post made by me are of my own creation. A delusional mind relayed in text form.