- purchase OVMS hardware at https://www.openvehicles.com/buy (don't forget the cable and antenna). FastTech shipping is very slow, but the $ savings over Medlock is worth it! Note: I bought the "WiFi only" version for now.
- remove/disconnect current TCU (plenty of threads on this)
- install OVMS hardware at https://docs.openvehicles.com/en/latest ... lation.html (you can create the OVMS account ahead of time if you want)
- install the OVMS app (iOS or Android)
Note: you can purchase a SIM card when you get a 4G modem (they have to release it first).
It cost me ~$100 plus 3-4 hours of time, but now I have something even better than CarWings/NissanConnect (with a modem upgrade path)!