Trying to update my M27 and I apply the "erase" image as the first step. Power it up and it does the rapid beeps, pause, rapid beeps then 2 beeps and green light. Power off, power on and it starts the head update process again. No beep, beep, beep. I can run the repair and get it back to normal, boots version 2 OK. But every time I try to update to 12 it does the head update cycle over and over every time its powered off and on again...any ideas?