How to update the firmware of M21: Click here

Note: 

If you would like to get the download link of the old firmware, please provide the SN code of your device to support@fiio.com. 

Do not downgrade the firmware before contacting us or the display may not display correctly!

It is recommended to use the latest firmware version for your device. 

Updaed at 2026-04-29

M21 FW1.0.8 firmware changes are as follows:

1. Added RETRO BOX Bluetooth control adaptation.

2. Added community sharing functionality to the system equalizer.

3. Added new retro theme “Pod Mode”.

4. Added May Day Festival themes to Cassette Mode (Note: To ensure the best festival theme effect, some festive themes will not display album art).

5. Added “Double press to exit Cassette Mode” option to the multifunction button (Go to Settings > General > Multifunction button to select).

6. Optimized an issue of repeated reboots when connecting the power adapter after low-battery shutdown.

7. Fixed an issue of occasional abnormality in Bluetooth transmission.

8. Fixed an issue of occasional low charging current.

9. Other performance optimizations and bug fixes.

1.新增RETRO BOX蓝牙控制适配

2.新增系统均衡器社区分享功能

3.新增全新复古主题“Pod模式”

4.磁带模式新增五一节庆主题

（请注意：为保证节庆主题效果呈现，部分节庆主题将不显示歌曲封面）

5.多功能键新增双击退出磁带模式选项

（可前往设置-通用-多功能键下选择）

6.优化低电关机后接适配器充电反复重启问题

7.修复蓝牙发射几率性异常问题

8.修复充电电流几率性偏小问题

9.其他性能优化和Bug修复

M21 FW1.0.8 firmware download link

Incremental firmware package:

m21pack.fiio.net/1.0.7/M21-ota-1.0.8.zip

Full firmware package: 

http://m21pack.fiio.net/beta/M21-update-1.0.8.zip

Updated at 2025-12-23

M21 FW1.0.7 firmware changes are as follows:

1. Added Car Mode functionality (Can be enabled via Settings > General).

2.Added long-press Previous/Next buttons for fast-forward/rewind (Supported only by FiiO Music).

3.Added AUTO EQ function to the system equalizer.

4.Added auto-sleep timer option for Remote Control (Can be configured under Remote Control > Settings).

5.Added Christmas, New Year and other festive themes to Tape Mode.Note: To ensure optimal display of festive themes, song covers will not be shown for some themes.

6.Fixed the issue of occasional pop noise during power-on playback for the first time.

7.Fixed the issue of occasional pop noise when switching tracks.

8.Fixed the issue of occasional pitch shifting in Bluetooth receiving mode.

9.Fixed the issue of incomplete status bar icon display.

10.Other performance optimizations and bug fixes.

Note: If the firmware version of your M21 is FW1.0.5, please go to FiiO Market and update the 'Firmware update' APP or install this APP(Click here) in your M21 first. Then download the full firmware package to update locally.

1.新增车载模式功能（可前往设置-通用-开启车载模式）

2.新增长按上下曲键快进快退功能（仅飞傲音乐支持）

3.新增系统均衡器AUTO EQ功能

4.新增远程控制自动休眠时间选项（可前往远程控制-设置下选择）

5.磁带模式新增圣诞、新年等节庆主题（请注意：为保证节庆主题效果呈现，部分节庆主题将不显示歌曲封面）

6.修复首次播放上电几率性有冲击声问题

7.修复切曲几率性有冲击声问题

8.修复蓝牙接收模式几率性变调问题

9.修复状态栏图标显示不全问题

10.其他性能优化及Bug修复

请注意，如您当前系统版本为1.0.5版本，请前往飞傲市场更新“固件升级”APP后再尝试升级，或联系客服进一步确认处理。

M21 FW1.0.7 firmware download link

Incremental firmware package:

m21pack.fiio.net/1.0.3/M21-ota-1.0.7.zip

Full firmware package: 

m21pack.fiio.net/beta/M21-update-1.0.7.zip

Updated at 2025-09-02

M21 FW1.0.3 firmware changes are as follows:

1. Optimized Tape Mode – VU meter theme effect.

2. Fixed the issue of occasional high power consumption during playback.

3. Fixed the issue of abnormal HOLD prompt display under Dark Theme.

1.优化磁带模式-VU表主题效果

2.修复播放时耗电几率性偏大问题

3.修复深色主题下HOLD提示显示异常问题

Updated at 2025-08-29

M21 FW1.0.2 firmware changes are as follows:

1. Added spectrum mode, VU meter mode, and multiple cassette themes. (Go to Settings - Global - Tape Mode Theme to select themes.(Theme 5/6 needs to work with the latest 3.2.9 version of FIIO Music: Click here))

2. Added the function of switching cassette themes by double-pressing the cassette case’s previous/next track button.

3. Added the function of long pressing the power button of the cassette case for about 5 seconds to power off.

4. Added auto power-on when USB is connected while the device is off.(Go to Settings - Global to enable USB auto power-on (disabled by default))

5. Added optimized battery charging function.(Go to Settings - Battery to customize maximum charging percentage)

6. Added options for self-defining button function.(Go to Settings -Global - Self-defined Button Functions to choose different button function schemes; when combined with the screen rotation function, buttons will rotate accordingly.)

7. Added DAC DRE function switch.

8. Fixed the issue where the HOLD function became invalid after restarting the device with the HOLD button enabled.

9. Fixed abnormal playback issue with certain songs after adjusting system EQ.

10. Fixed the issue of occasional high power consumption in standby mode.

11. Miscellaneous performance improvements and bug fixes.

1.新增频谱模式、VU表模式及多个磁带主题

2.新增双击磁带壳上一曲/下一曲切换不同磁带主题功能

3.新增长按磁带壳电源键约5s关机功能

4.新增关机状态接入USB自动开机功能

5.新增优化电池充电功能

6.新增按键功能自定义选项

7.新增DAC DRE功能开关

8.修复开启HOLD键重启设备后HOLD功能失效问题

9.修复调节系统均衡器后部分歌曲听音异常问题

10.优化待机几率性耗电大问题

11.其他性能优化和Bug修复

备注：

1.可前往设置-通用-磁带模式主题下选择

2.可前往设置-通用下设置接入USB自动开机功能，此功能默认关闭

3.可前往设置-电池项下设置，自定义最大充电百分比

4.可前往设置-通用-按键功能自定义下选择不同的按键功能方案，搭配屏幕翻转功能使用时按键也可同步翻转

Updated at 2025-06-05

M21 FW1.0.1 firmware changes are as follows:

1. Added remote control functionality.

2. Added multiple new preset wallpapers.

3. Added quick access to Cassette Mode (Accessible via the Cassette Mode icon on the desktop/dropdown menu/multifunction button).

4. Added adjustable output volume for system USB (Enabled by default, go to Settings > Audio to adjust it).

5. Added automatic cassette case detection to prevent accidental Cassette Mode activation (Enabled by default, go to Settings > General to adjust it).

6. Added multifunction button support for entering the Cassette Mode/calling up the dropdown menu (Go to Settings > General > Multifunction Options to adjust it).

7. Added "Use cover image in the same folder" option (When enabled, if a song has no embedded cover, the first image in the same folder will be used as the cover. Go to Settings in FiiO Music to enable or disable it).

8. Added lock screen cover art display in FiiO Music

9. Fixed the issue where some chargers failed to charge or trigger Super High Gain Mode.

10. Fixed the issue where audio may be abnormal in Bluetooth transmitting and receiving.

11. Fixed the issue where desktop folders could not be renamed.

12. Fixed the issue where the play/pause button lock function would fail after sleep mode.

13. Fixed the issue where songs on certain NAS servers using WebDAV protocol would fail to play.

14. Improved some UI display effects.

15. Miscellaneous performance improvements and bug fixes.

1.新增远程控制功能

2.新增多套预设壁纸

3.新增磁带模式快捷入口

（可从桌面磁带模式图标/下拉菜单/多功能键进入）

4.新增系统USB输出音量可调功能（可前往设置-音频选项下设置，默认开启）

5.新增磁带壳自动检测功能，防止磁带模式误检测开启

（可前往设置-通用选项下设置，默认开启）

6.新增多功能键进入磁带模式/唤出下拉菜单功能

（可前往设置-通用-多功能选项下设置）

7.新增同文件夹任意名称封面选项

（开启后，当歌曲无封面时，将使用同文件夹下第一张图片作为歌曲封面，可前往飞傲音乐设置下选择开启或关闭）

8.新增飞傲音乐锁屏封面显示

9.修复部分充电器无法充电或无法触发大耳模式问题

10.修复蓝牙发射/接收几率性出现声音异常问题

11.修复桌面文件夹无法重命名问题

12.修复休眠后播放/暂停键锁定失效的问题

13.修复部分NAS服务器WebDAV协议下歌曲无法播放问题

14.优化部分UI显示效果

15.其他性能优化及Bug修复