MOST bus broken ?

[wikouza]

Hello guys, I'm owner of E88 with following options :
CiC
Business satellite navigation
Bluetooth for mobile phone
6FL aux/usb under armrest
...
Since I got the car it has the SOS malfunction and usb/aux under armrest don't work.

I removed screen and radio, installed android head unit.
The amp is not on the MOST bus so I don't have audio problem beside the system does not output car's errors.

I'm planning remove the CIC knob/buttons and DIY a wireless charging mat + amovible double cup holder above it.
I'm just wondering about the MOST modules, part of it I identified are :
Radio (I removed)
TCU
MULF2

It would be nice to have the usb/aux under armrest working even though it's just for charging but I don't know if that's achievable in that setup. I don't even know if my MULF2 is functional.
I got a fiber optic loop bypass plug to bypass the radio but figured the MOST signal seems broken even before the radio because there's no light coming out of the radio optical fiber wires.

If there's no way or if I figure MULF is dead then I will just remove it with the TCU.

Any ideas or remarks are welcome are appreciated