The community has found some success using a tool called "Uni-Android Tool" , which is a paid software. This tool can flash the necessary files even on locked bootloaders. This is the primary, though not free, method.

Often cited as the best for performance, as it strips away the heavy "ZTE UI" for a clean, stock Android experience.

For US users on AT&T or compatible MVNOs, the stock firmware retains the necessary IMS configurations for Voice over LTE (VoLTE), which is mandatory since the shutdown of 3G networks. Notable Stock Build Versions

For daily usability, the is undisputed. It is the only option that preserves complete, bug-free utilization of the dual screens while maintaining proper modem functionality for modern cellular networks. If performance feels sluggish, flash this official version, gain root access via Magisk, and manually strip away the carrier bloatware for the cleanest possible dual-screen experience.

If your device is hard-bricked or stuck in a boot loop, you need the Qualcomm Low-Level tools.

If you crave a more modern Android experience or want to remove carrier bloatware, custom ROMs are the way to go. However, be prepared for a much more complex journey.

Always make a full QCN backup (IMEI/radio config) using QPST before flashing any firmware. If you lose your IMEI, the best firmware in the world won't make calls.

ZTE Axon M Z999 Go to product viewer dialog for this item. Firmware Best Guide: Elevating Your Dual-Screen Experience in 2026 The ZTE Axon M (Z999) Go to product viewer dialog for this item.

The standard method involves flashing Magisk through TWRP 1.2.2.

. While the device reached its official end-of-life status years ago, selecting the "best" firmware involves a choice between the stability of official builds and the updated features of unofficial community ROMs. Official Stock Firmware (Best for Stability)

Even on the best official stock firmware, you will encounter problems inherent to the Z999 model:

There have been attempts by developers to port newer versions of Android (usually LineageOS 14, 15, or 16) to the Axon M.

Turn off the phone, then hold to enter Recovery Mode. Select "Apply update from SD card" .