Reports claim that the next batch of ZTE Nubia devices will ditch the company's Nubia UI for good and make the switch to stock Android. There's a chance both the Axon and Nubia lines share the same "Stock UI" that has been reported.
https://www.notebookcheck.net/Upcoming-ZTE-Nubia-devices-will-ship-with-stock-Android.287726.0.html