I just tried this, I was able to flash the first gpu with ko edition bios and the second one would not flash, it says hierarchy mismatch error, I used the exact same command, but both cards are running at the ko edition speed because the second card overclocks itself to run at the first card speed, it is verified via gpu z, but when I tried to flash back the first gpu to original bios I got the same error, so both cards are running at the same speed but with differnet bios, I would like to actually get them to run with the same bios. I just want to know how you guys got to flash right, because it certainly wont do it for me with the above commands.