[Help] Can't flash Gigabyte BIOS firmware: "File size incorrect"

I'm trying to upgrade my GA-X58A-UD3R rev 2.0 firmware from version FE to FH.

BIOS sees the file X58AUD3R.FH on my USB, but says "File size incorrect."

I do not have Windows installed. I tried disabling hyperthreading etc (Googling showed this as a suggestion) but to no avail.

Do I really need to install Windows just to upgrade my BIOS?

Is it even worth the bother?

submitted by /u/dan_zg
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