BIOS R1.20 is for AX6F-1 ONLY. If you have AX6F-2.X, please use BIOS R2.XX.
If you are upgrading your AX6F from BIOS R2.00, please make sure to clear & update DMI contents by executing the flash utility with following extension:
c:\AOFLASH AX6F210.BIN /CD
It will update the Desktop Management Interface(DMI) pool in order to fully support Advanced Desktop Management (ADM).