I have no knowledge of the Bosch set- up but had a problem with my Pro Rider Flare Dapu Mid Motor magnet and sensor . If the magnet on the front wheel has too great a gap from the pick-up, the display goes blank and the Motor doesn`t power . A ticking noise alerted me to a tight gap , so I put the magnet on another spoke , too big a gap and no power or display . Careful alignment giving a gap of only 0.1 mm solved the problem . Still a bit too tight for my liking though , but it works .