I downloaded the 10/28/02 Bios and my network card stopped working!
I then tried to flash the 9/20/02 Bios you posted and got the same result.
I was banging my head against the wall for hours last night trying to figure this one out. Uninstalling, reinstalling drivers, resetting my router and firewall, trying a PCI network card (which by the way made my PC slow as a dog in any slot for some wierd reason).
I'll go back to the 8/xx/02 or one of the older Bioses when I get home from work, hopefully one of those will work.