My December 2015 Model S told me it was ready to install Software Update v8.1 (17.11.10) today and that it would take 1 hour and 40 minutes. I started the install and was surprised to get a message that it was successfully installed about 15 minutes later. I went out and read the release notes, expecting some big changes in the audio interface and perhaps the internet app. All I found on the release notes was 1) Favorites Radio Station, 2) Ratings and Open Hours, 3) Voice Commands for Favorite Locations. Is that all there is for non-AP2 cars? Adding insult to injury, my Tesla iPhone app no longer communicates with the car, despite being updated. Any ideas? Hints? Any way to reload the 8.1 update?