I got that Joying unit also over the Holidays and started the replacement while trying to avoid taking the dash apart.
I won't use the SIM Card so that's one less 'relocation' to worry about and a pair of antenna I won't need to worry about either.
So far so good, the wiring harness was long enough and easy to pull the old JVC out.
Created an 'adapter' harness that's now working, the radio booted and everything seems to run (except GPS, see below).
All I've left to do, is choosing to replace the radio holder (or not) AND figuring out where to route the GPS antenna.
Did you take the dash apart to position the antennas (pretty sure Xavier did for Rudholm) or did you manage to position them while keep the car 'whole'?
I'm trying to sneak my hand around inside the radio opening but can't feel any gaps to run the wire down to either of the sides.
I was hoping to exit the wires down below the dash on either side and run the wire along the seats into the back, the way I did for OVMS.
If you use Android Auto, see my prior Q. If it's just a screen mirror of phone or like the car implementation