How to update the firmware of JM21: Click here

Updated at 2025-01-20

JM21 FW1.0.5 firmware changes are as follows:

1. Added a new function of Double tap to wakeup (enabled in Settings-Global).Kindly note: Enabling this function may slightly increase system power consumption. Please enable it according to your needs.

2. Miscellaneous performance improvements and bug fixes.

1. 新增双击唤醒功能（可前往设置-通用下开启双击唤醒功能）请注意：开启双击唤醒功能后，系统耗电将会略微增加，请根据需求开启使用。

2. 其他性能优化和Bug修复

JM21 FW1.0.5 firmware download link

Full firmware package: Click here

Incremental firmware package: Click here

Updated at 2025-01-09

JM21 FW1.0.4 firmware changes are as follows:

1. Added the feature of removing third-party app desktop icons.

2. Fixed the issue where local playback may pause automatically.

3. Fixed the issue where playback may crash in Pure Music mode.

4. Optimized memory management strategy to improve the smoothness of foreground applications.

5. Miscellaneous performance improvements and bug fixes.

1.新增第三方应用桌面图标移除功能

2.修复本机播放几率性自动暂停问题

3.修复纯音模式几率性闪退问题

4.优化内存管理策略，提升前台应用流畅度

5.其他性能优化及Bug修复

JM21 FW1.0.4 firmware download link

Full firmware package: Click here

Updated at 2024-12-31

JM21 FW1.0.3 firmware changes are as follows:

1. Added a key lock setting feature (go to Settings > Global > Key-lock Settings to select which keys to lock when the screen is off).  

2. Added shutdown charging function.

3. Optimized compatibility of USB Audio output.  

4. Optimized stability of Bluetooth decoding mode.  

5. Fixed the issue where there might be no output in USB DAC mode.  

6. Fixed the issue where it failed to connect to hotspots of certain mobile phones.

7. Fixed the issue where the “disable charging” function would not take effect after a reboot.

8. Miscellaneous performance improvements and bug fixes.

1.新增锁键设置功能（可前往设置-通用-锁键设置下选择熄屏下需要锁定的按键）

2.新增关机充电功能

3.优化USB Audio输出兼容性

4.优化蓝牙解码模式稳定性

5.修复USB DAC模式几率性无输出问题

6.修复无法连接部分手机热点问题

7.修复禁止充电重启后不生效问题

8.其他性能优化及Bug修复

JM21 FW1.0.3 firmware download link

Full firmware package: Click here

Incremental firmware package: Click here

Updated at 2024-11-18

JM21 FW1.0.2 firmware changes are as follows:

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 FW1.0.2 firmware download link

Full firmware package: Click here