I have a TS18 based head unit installed in a BMW 5 series (e39).My unit has been stuck in a boot loop for a month.I have what I think is a correct firmware on a FAT32 stick. It detects it on boot, says "TS18 upgrade" then "done" and goes back into the loop.I am trying to figure out how to do the proper reset so that it clears the existing firmware and reloads it.As shown in the picture, there is a reset button. I've tried using this, tried holding down the power button, tried grounding...Read more