My question is nearly the same. I have an Audi with MMI 3G Navigation System. The MMI 3G has an internal UMTS (3G) modem which allows to use Google Maps and some other feature like whether, news,...and WLAN hotspot
So in germany the provider are shutting down UMTS until this summer so the internal modem is useless because GPRS (2G) is to slow. Some people find a way with an external router from TP Link (with openwrt software) and an LTE stick (Huawei E8278 or E3276)..
Therefore it's neccassary to pair the TP Link via WLAN to MMI unit, connect to internet via LTE stick and allow the MMI unit to access to internet.
Is this possible with RUT 850 too?
Greetings from Germany