The first attempt was to simply run the BIOS install for the version i wanted to FLASH, the snag is that the tool does not let you flash a BIOS that is older than the currently installed BIOS.
Not one to give up easily and determined to revert to the older BIOS.
The tool will then allow you to flash the older BIOS over the newer one.
CheckByBiosErrorMessage="This BIOS file is not allow to flash. The flash process will be terminated."
;This flag is the switch of checking BIOS version.
; default : 2.
; 0 : Don't check rom file version.
; 1 : Check BIOS version.
; When rom file version is older than BIOS, it will display
; a warning message and close application.
; 2 : Depend on BIOS report.
; default : 0.
; 0 : Normal process.
; 1 : It will pass version by IHISI to BIOS and check by BIOS.
; When BIOS return not allow to flash, it will be terminated the process.
; When BIOS allow to flash, it will go ahead and do it's normal process.
; When this flag is enable but BIOS not support, it will skip version check and assume allow to flash.
; default : "This BIOS file is not allow to flash. The flash process will be terminated."
; String : User defined error message when BIOS is not allow to flash this version image.