No official way as far as I know. Dealer did it for free on goodwill, my car is out of warranty.Is there a way to download the 21.9.0 software update yourself or it's only on the dealer portal?
That’s the same application version I had on my 2018. Best path is dealer I’d think. They can be on the hook if the update goes sideways for any reason. Be aware updating may reset your navigation map database! It did for me even at the dealer. My navigation does not work for now. That’s probably why we never got an official way to update early 2018 Compass radios until the paid map update came out.
Uconnect Customer Care is still working on getting my car updated to the latest. There’s a specific update path, probably since upgrading directly to the latest may brick the radio. I plan to purchase new maps later this month to replace my missing map database.
Would highly recommend 21.9 over what you have now, if you can deal with no nav. Lots of bug fixes from the early software in 18.7.