"Check for updates" icon to check manually.
Local upgrade
Also, the JM21 can be upgraded locally by a firmware package.
Download the firmware package file from FiiO website, and copy it to
the internal storage of the JM21 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.
2.Force to reboot