Nubia has long been a separate company from ZTE but it appears that some of the ZTE traits still lives with Nubia.
In June last year, Nubia released its bezel-less flagship, Nubia Z17 and at the time, it was pre-installed with the Nubia UI based on Android 7 Nougat. However, this smartphone subsequently got the Android Oreo update. It is now clear that the Oreo update will be the first and only major update that the Nubia z17 will get. The company announced that it would stop the update development of Android 9 Pie, which means that its official system will stop at the current Android 8.1. This is quite disappointing and its a shot on the leg for owners of this supposed flagship smartphone.