Note: When you click the links below to download the firmware, it indicates that you have already read and agreed to the Open source licenses.

How to upgrade the M15S：Click here

Updated at 2023-05-11

M15S FW1.0.3 Firmware download:

Incremental firmware package: Click here

Full firmware package: Click here

The following changes and improvements have been made to the M15S in FW1.0.3:

1. Added a new function of iPhone decoding under USB DAC mode (After enabling the iOS devices decoding function on the menu of Settings - USB DAC, the device can be connected to an iPhone/iPad, etc. This function should be disabled when connecting to a non-iOS device);

2. Optimized text misses when switching songs of different sampling rate;

3. Improved the speed of downloading apps in the FiiO application store;

4. Fixed the issue where files in the micro SD card may stutter;

5. Fixed the issue where the light would be blue when connecting to the RM3;

6. Fixed the issue where the playback would fail in the Audible app;

7. Miscellaneous performance improvements and bug fixes.

M15S FW1.0.1 firmware download: 

Click here

Click here