All I can think of is that you need to find someone with ISTA or other programming software for bmw, and RESET the module...or recalibrate.

I do not believe it needs a 'software update'.

There may be internal switches, limits, current triggers- that need to be reset so the DME knows how to control the module.

It isnt a "dealer only' thing. It is a "someone that knows BMW software" thing