Firmware upgrade, factory data reset
and technical support
1.How to upgrade firmware?
The JM21 supports online upgrade and local upgrade.
Online upgrade
If a new firmware is available and can be detected (with the JM21
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
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