ZTE Axon 7 Mini update going live with camera enhancements and December Android security patches
However, the changes differ between the three different firmware releases. Users who receive the B12-B21 build will get VoLTE support, Google's security patches through December 2016, a new APN to match major U.S. carriers, updated Google apps, camera optimizations (improved focus speed and night mode), and other general enhancements.
Meanwhile, those who get the B14MR2-B21 & B16-B21 releases have already gotten the aforementioned updates through their carrier, save for Google's security patches, the new APN, and the general enhancements.
ZTE recommends charging your smartphone above 30% before installing the software update. The affordable smartphone is powered by the Snapdragon 617 processor and features a 1080p resolution screen, 3GB of RAM, a 16MP rear camera and front-facing speakers.
via Android Central