It appears there are now 3 revisions of your motherboard - so determining which version you have might help. All I'm finding is Rev 3.0 of your motherboard on thier site.
Double-check to see that the BIOS you downloaded is the exact same size that is from their site. The file you download should be a .zip file, and so you will need to extract the .bin from the .zip before trying to install it. NEVER FLASH THE BIOS FROM WITHIN A ZIP FILE! I'm looking at the .bin, and it is 1,048,576 bytes. The zip also has the flash utilities. It is recommended to boot off of a floppy, flash, or CD, to DOS, but the WinFlash util should work from Windows - I've flashed many a PC from Windows, but still like to boot to DOS (or my latest system has the ability to flash from BIOS too).
I'm downloading the manual at this time, but it is taking next to forever... I'll respond again when I can see what your BIOS looks like.
Double-check to see that the BIOS you downloaded is the exact same size that is from their site. The file you download should be a .zip file, and so you will need to extract the .bin from the .zip before trying to install it. NEVER FLASH THE BIOS FROM WITHIN A ZIP FILE! I'm looking at the .bin, and it is 1,048,576 bytes. The zip also has the flash utilities. It is recommended to boot off of a floppy, flash, or CD, to DOS, but the WinFlash util should work from Windows - I've flashed many a PC from Windows, but still like to boot to DOS (or my latest system has the ability to flash from BIOS too).
I'm downloading the manual at this time, but it is taking next to forever... I'll respond again when I can see what your BIOS looks like.