One of the better supported Android devices is in fact .. Nvidia’s Shield series. The tablets have always been supported with many and plentiful updates and upgrades, but that comes to a halt as it is now confirmed by an Nvidia employee.
Manuel Guzman from Nvidia, also known as ManuelG (active) in our forums, posted in a Twitter update that Android Oreo will not be coming to the Shield tablets. The Shield K1 however will get an update soon, yet based on Android Nougat, but the older models will not see a higher Android version through an OTA update.
Typically manufacturers usually stop updating / support for Android devices after two years as that is the plague with Android. However, Nvidia always stated that the Shields would get updated for as long as possible for all models. The Shields tablet is now roughly three years old.