Sounds like the flash was interupted mid stream. A minute isn't long enough. Ive seen the lights stop flashing for several seconds then start back at it again. Ive also seen them not flash at all this is where a USB stick with an activity light comes in handy.
Go to the ASUS support page and download the latest BIOS.
Format a USB with Fat 32.
Extract the BIOS zip file. rename CAP file, in your instance. M9H.CAP then copy the file only, not the folder, to the root of the fat 32 formatted USB stick.
Put the stick in the flashback port and as you did before press and hold the button for 3-5 seconds and let her rip, If you see it going just walk off and come back in 10 minutes, thats more than enough time for it to finish and the blue light on the button should be out as well. If that doesnt work remove everything but the CPU and one stick of ram in the A2 slot. Less hardware is better. If you still get nowhere remove everything, it will actually work with nothing in the board but the ATX power connection and the USB stick. No CPU or ram necessary.
“Two things are infinite: the universe and human stupidity, I'm not sure about the former” ~ Albert Einstein