Just upgraded a A5 from Radio(CAN-bus) to MMI 3G.
Now no units in the infotainmentsystem (Headunit, Amplifier, Radio) is working, and no diagnostics is possible with theese 3 units.
No light in headunit, no light in MMI buttons, but DVD drive is running, can hear it. If i do the MMI reset with the 3-buttons, i can hear the DVD stop,and starts, so it seems like the unit is working, just canīt communicate through the fiberoptics.

here is what i have tried:
* Power to all units= ok
* Ringbreak diagnostic, Gateway=OK, Amplifier=OK, Radio=OK - Headunit is not listed at all, thatīs correct?
* Tried with other optic cables and only connected headunit and gateway together = same result: no communication.
* Tried with other head-unit
* Tried with other gateway

Any good ideas?

Below Autoscan: