Hi Have one of these...
https://www.sardincar.com/bmw-x1-e84...imedia-player/
I had the No Signal issue - see this forum thread...
https://f30.bimmerpost.com/forums/sh....php?t=1500481
Yanzi from Sardincar was very helpful. The software/firmware updates he provided (from his supplier) didn't work so he replaced the unit. I think the supplier changed the PCB. I installed it last week and it is working with no problems. It came with iGO Navigation but you can install any Android nav system you like.. You can also mirror your phone (Android or iPhone).
I'm very happy with the unit.