Well Ill take a guess that I've performed over 100 flashes on the E38 ECM with the vast majority on Accessory. With most of my logging now, I start the log with the ignition on accessory as well so I can read all the changes as the ECM comes to life on the reds. The fact that flashing on accessory does not bring up all the alarms is great, though the look on peoples faces as you start the flash on their car, only to have alarms go off is pretty funny.....