congratulations - great job - well done.
Could you just confirm, whether I summarize correctly:
You had before OEM-wise a MULF and a TCU and replaced both devices by a new combox Telematics, right?
Some additional questions:
Did the Assist function work directly after combox install?
Do you have option 6NF installed in your M3?
Do you need after combox installation the new multimedia snap-in adapter to connect the iphone to the car?
Can you access Video files in your iPod/iPhone over USB?
As far as I know did you the first successful retrofit in the German-speaking area.
It would be brilliant if you can start a short diy threat in motor-talk.de.
Wish you a relaxed Sunday and enjoy the combox functions.