Two things I can think of you might try to get it updated:
- make sure the car can stay connected to any wifi network. So if its parked close enough to your home, then your home wifi might work. Otherwise, if your phone data limit is high enough, you might want to consider enabling your phone’s hotspot during a long trip, and connecting the car to your hotspot while driving. Beware that you won’t be able to use wireless Carplay/Android Auto while your hotspot is active.
- Check out this page to dive into the engineering menu, go to System > Version IVI and press the ‘Check for updates’ button. You won’t see anything happen, but it might help trigger an update. Be careful in that engineering menu, you don’t want to change anything else in there except if you know what you’re doing!