The ZTE Axon 7 was updated to Android 7.1.1 last month, becoming one of the few non-Google devices to officially receive it. A new software update, referred to as 'B25' by ZTE, is now rolling out to the Axon 7 A2017U with a few minor new features and bug fixes.
Here's the full changelog:
Enables "Night Mode" setting
Supports 256GB microSD cards
Allows users to disable some stock apps
Optimizes the "Do Not Disturb" function
Fixes various Wi-Fi Calling issues
Improves device stability and security
Miscellaneous performance improvements and other fixes
Users on the update's forum post, linked below, are reporting that the B25 update does not include April security patches. Which is a bit disappointing, considering April is just about over. You can find more details at the source link below.