Hey guys! I just updated my firmware and all is well on my A04. It wouldn't run within Windows XP Pro SP1, so I just copied the extracted files to a floppy disk and ran the upgrade program from within real DOS. It worked like a charm!
Be sure you use a good floppy...it constantly reads from the disk during the update, which lasts about 25-30 seconds.
Once I booted back into Windows, it found all of my optical drives over again. I had to select the region of the DVD drive before it would work with DVD movies.