Firmware upgrade, factory data reset and
technical support
1.How to upgrade firmware?
The M21 supports online upgrade and local upgrade.
Online upgrade
If a new firmware is available and can be detected (with the M21 connected to an
available internet), an upgrade notification will show up in the notification center.
Tap on it to enter the update menu for the online upgrade. If there's no upgrade
notification showing up, you can go to the "Technical Support->Firmware
Upgrade" menu, and tap the "Check for updates" icon to check manually.
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