The latest release does not properly detect a computer that is missing the calibration data, so it will apear to be dead. IT IS NOT DEAD, but you will not be able to comunicate with the ecm until Blacky releases a fixed EXE.
The only reason why you would ever have missing calibration is if the ecm was full flashed with the first stage of the custom os files when you do the full flash. Those have empty calibration as you have to put in your calibration data.. SO PLEASE DO NOT DO IT.