The Nvidia Shield Tablet K1 has been around long enough to move from Lollipop to Marshmallow and then to Nougat. Sadly, it has just been confirmed that this slate for gamers will not get an official Oreo update.
https://www.notebookcheck.net/The-Nvidia-Shield-Tablet-K1-will-not-get-Oreo.258356.0.html