O'k, here are my results... <img border="0" title="" alt="[Wink]" src="wink.gif" />
I did sucsessfully reflashing using downloaded from that site BIOS update tool.
It did bootable (Win98) diskette with awdflash,BIOS file and autoexec.bat for reflashing.
Process went without problem,awdflash recognized the BIOS chip (by the way, the same as Your),erased, reflashed, rebooted PC and... LoL! I've got older version of BIOS than I was having before...
So, I reflashed back my an "old" BIOS...

1. I tried AMIflash utility, and it didn't recognized my chip.
2. Also I tried new Uniflash utility, and it did recognize the chip.
3. And I used older (version 5.35) of awdflash for reflashing back my original BIOS also with no problem.

So,I was wrong - that utility (what comes with BIOS update) works with that particular chip...

So,if flash utility recognizes Your BIOS chip - should be no problem for reflashing it back.
From what You have said, I would assume,what only bootblock is survived in Your motherboard (that's why keybord isn't working).
So,You should have to create bootable disk, copy to this disk awdflash utility,BIOS file and create appropriate autoexec.bat for working in unattended mode.
It could be look like this keystroke:
awdflash filename.bin /F /Sn /Py

where /F - using buit-in original flash chip reflashing routine (needed for reflashing boot blocks - may be not working in some of an old versions).
/Sn - do not save an old BIOS,
/Py - confirming reflashing new BIOS file.

Good luck! <img border="0" title="" alt="[Wink]" src="wink.gif" />