I never quite trust the idea flashing a bios. 
I don't mind it all that much...EXCEPT...
(1) I don't trust them to get the "write the new one then switch" logic
right to avoid trashing things in case of power-offs while writing.
(2) I *really* dislike systems that do this without having a hardware
facility to disable writes - such as a pair of jumper pins which must
be jumpered to write.  (If software can do it, rogue software can do
it.)
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