AMD boards with AMIBIOS8 can recover from USB stick.
The way it works on my DKA 790 Platinum, I used BIOS A7550AMT.150 (Winki BIOS) but I managed to kill it because I was altering (as in editting) the BIOS, but it went wrong.
Recovery is simple:
Put an PCI-e videocard in the machine, onboard will probably fail.
Power the machine with CTRL-Home pressed, now be patient, as it will probably tell you what file it expects.
Mine told me A7550AMT.1xx
So I prepared an USB-stick FAT(32) with A7550AMT.150 (original one), nothing else.
I put it in the USB-slot near the Network-connector.
Then Poweron with CTRL-HOME pressed until it starts reading the BIOS.
However it wasn't able to restore the BIOS, but was able to boot Windows! (I pressed F2 to continue)
Now boot into Windows and run AFUWIN version 4.10 or higher, should be a part of LiveUpdate (install it if you don't have it, then run the file from program-files).
This is Windows flashing so be VERY carefull!! Shutdown all programs you can!
Well flash your BIOS with AFUWIN (only for recovery, not for normal flashing), see settings below, what ever you do, do NOT overwrite the bootblock because if that fails you can't recover for sure!
After flashing reboot and go into the BIOS, and set the settings you need.
This worked for me, so I hope it works for you too.