That is one thing I've tried.
I've tried the ATI reference BIOS as well as BIOS (of the same version as the reference) from Sapphire, XFX, and MSI. On the same card from other vendors, these BIOS flashes work perfectly, but not on the ASUS.
I've also tried flashing with a direct backup of the ASUS BIOS, and I get the message "Flash Already Programmed". If I try to force the flash (like you have to do for the BIOS files from other vendors) I get the same error as when trying to flash with a BIOS from another vendor.
I've tried the ATI reference BIOS as well as BIOS (of the same version as the reference) from Sapphire, XFX, and MSI. On the same card from other vendors, these BIOS flashes work perfectly, but not on the ASUS.
I've also tried flashing with a direct backup of the ASUS BIOS, and I get the message "Flash Already Programmed". If I try to force the flash (like you have to do for the BIOS files from other vendors) I get the same error as when trying to flash with a BIOS from another vendor.