I can't find any reference to the Z270H /K1 on asus's web site, only the Z270 H. If your bios is ver 02.0 then the reason you can't flash it is because 0906 is for the Z270H and not the K1 version. The first released bios for the Z270H was 0702, so I don't know what variation board you have. Sorry, no help I'm afraid.