Do Not try to do a BIOS update under Wine. The best thing to do is first check to see if the CD/DVD that came with your computer boots DOS. If it does, use that. If not, then google freedos. I think that works fine. I've just always kept a copy of DOS around, just in case. Also, as MS3FGX mentions, a lot of BIOSes come as a floppy image with DOS on it.
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