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.
2) Local upgrade
Also, the M21 can be upgraded locally by a firmware package. Download the
firmware package file from FiiO.com, and copy it to the internal storage of the
M21 or an SD card. Go to the "Technical Support->Firmware Upgrade->Local
Upgrade" menu, and find the firmware package file to start the upgrade.
Notes:
1) Do not unzip the firmware package file.
2) Before the upgrade, ensure the power of the device is adequate (>30%) so to
avoid upgrade failure.
3) If the device goes to factory mode which cannot detect the firmware, the
reason may be that the firmware file is damaged. At this time, press the power
button to reboot the device. Re-download the firmware file and restart the
upgrade.
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