Doh, downloaded the new bios - "selected file is not a proper bios". Pretty sure I did that right - download, extract, rename, move to usb stick, enter bios, EZ flash....nope. Will see if maybe I am ...
ASUS has improved its Z890 chipset motherboards for Intel processors by making BIOS updates easier. The new Z890 motherboards now allow BIOS updates using ZIP files through the EZ Flash 4 interface.
Please check the relevant support website for the motherboard model to make sure the compatibility of BIOS Flashback and EZ Flash 3.