Specifically, if you are on AT&T or using the device unlocked, the final official OTA (Over-The-Air) update is your best option. There are no official Android 8.0, 9.0, or 10 builds. Any custom ROMs (like LineageOS) available for this device are generally unstable "beta" ports that break the fundamental feature of the phone: the dual-screen functionality.

The most stable official version typically ends in Nougat (7.1.2) or an early Oreo (8.1) build, depending on the regional carrier.

For U.S. users, updates are typically handled via OTA (Over-The-Air). You can check for updates by going to Settings > AT&T Software Update > Check for Updates .

: Click the Download button inside QFIL to begin writing the firmware onto your device. Avoid touching the cable or the computer until the application status bar displays a green "Download Succeed" message.

If your Axon M is stuck in a boot loop, has been "bricked" by a bad flash, or is unresponsive, you can attempt to recover it using Qualcomm's Emergency Download Mode (EDL). EDL is a low-level protocol that allows you to flash firmware directly to the phone's processor. To use it:

While there isn't a widely "official" stable build for the , unofficial ports sometimes appear on XDA Forums or LineageOS sites. Project Treble (GSI): Since the