How to upgrade the M33 R2R: Click here

Updated at 2026-04-29

The following changes and improvements have been made to the new firmware 1.0.2:

1. Added community sharing functionality to the system equalizer.

2. Added new retro theme “Pod Mode”.

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

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

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

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

7. Fixed an issue of occasional low charging current.

8. Other performance optimizations and bug fixes.

1.新增系统均衡器社区分享功能

2.新增全新复古主题“Pod模式”

3.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）

4.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）

5.优化低电关机后接适配器充电反复重启问题

6.修复蓝牙发射几率性异常问题

7.修复充电电流几率性偏小问题

8.其他性能优化和Bug修复

M33 R2R FW1.0.2 firmware download link

Incremental firmware package:

m33r2rpack.fiio.net/1.0.1/M33-ota-1.0.2.zip

Full firmware package: 

m33r2rpack.fiio.net/beta/M33-update-1.0.2.zip

Updated at 2026-02-06

The following changes and improvements have been made to the new firmware:

1. Added RETRO BOX Bluetooth control adaptation.

2. Added Auto EQ function for automatic online update of headphone curves. 3. Optimized some charging compatibility issues.

4. Optimized some UI display effects.

5. Other performance optimizations and bug fixes.

M33 R2R FW1.0.1 firmware download link

Incremental firmware package:

m33r2rpack.fiio.net/1.0.0/M33-ota-1.0.1.zip

Full firmware package: 

m33r2rpack.fiio.net/beta/M33-update-1.0.1.zip