How to upgrade the JM21?

The JM21 supports online upgrade and local upgrade.

1.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 "Check for updates" icon to check manually.

2.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.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.

JM21 V1.0.1 firmware changes are as follows:

Updated at 2024-11-19

1. Fixed the issue where noises may occur in USB output in third-party apps.

2. Fixed the issue where volume adjustment was unavailable in USB output in third-party apps.  

3. Fixed the issue where noises may occur when playing DSD over Bluetooth mode.

4. Fixed the issue where the indicator light would automatically turn on after being turned off.

5. Fixed the issue where the indicator light showed red even when fully charged.  

6. Added the function of automatic pause after 2 minutes of playback when no headphones are inserted.  

7. Improved compatibility of EXFAT cards.  

8. Miscellaneous performance improvements and bug fixes.

JM21 V1.0.1 firmware download link: Click here