From BMW Retrofit Flight Deck:
Combox Retrofit is coming soon
We did a series of successful tests at our lab and may now confirm - It is an amazing add-on for your CIC
At the pictures you may see how new Combox looks like and also its comparison to the good-old MULF2HI module which Combox is a replacement for
Note: Combox is not a direct snap-in replacement for the MULF and TCU units. Some additional wiring will be required. Complete installation guide will be provided for all Combox kits sold by BMW Retrofit.