The device could to be reset to factory data mode in recovery mode if M21 password is
forgotten or M21 freezes or M21 no reaction during update.
Turn off the device first. Hold the volume down button and plug a USB cable in for power
supply. It will enter recovery mode after turning on. On the display, choose "Wipe
data/factory reset->Yes until it finishes. Then choose "Reboot system now" to start the
device.
Notes:
Switch menu: short press the volume +/- buttons or previous/next track button
Confirm: short press the power button.
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