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Reply:18 Read:47672   2023-01-06 11:50:38

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 FW5: Click here

Updated at 2024-01-26

FW5 v1.6 download link: Click here 

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

1. Optimize battery management

2. Fixed an issue that the voice tone changes after the headset is actively connected when the aptX adaptive Bluetooth coding is connected to some mobile phones

3. Add custom EQ to support high-low-pass filter adjustment

4. Add a custom EQ name

Updated at 2023-06-16

FW5 v1.53 download link: Click here

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

1. Added support for Bluetooth codec LDAC

2. Miscellaneous bug fixes.


(1) If the new firmware affects the experience, you can revert to the previous firmware version. Download it at the above link.

(2) After the successful upgrade, please reset the device.

Reset the FW5: Hold the button with a raised dot on the earbud

Reset the UTWS5: Put the two ear hooks inside the charging case. Close the case and reopen it, and then hold the button on the case for about 12s.

Firmware Explanation

Since LDAC requires extremely high transmission bandwidth, and TWS earbuds contain double wireless units which require double the bandwidth to transmit two channels simultaneously, we can only guarantee that the firmware released this time supports LDAC in some devices instead of perfectly being compatible with all. So please decide whether to upgrade or not based on your needs. If it affects your experience, it is suggested to revert to the previous stable version.

After updating the firmware, please enable LDAC from FiiO Control App-Select Bluetooth codec before using LDAC Bluetooth codec  (LDAC Bluetooth codec is off by default.) If the output audio is not stable when using the LDAC for the first time, please reset the FW5/UTWS5 again.

Devices supporting Snapdragon Sound are suggested to upgrade the firmware

According to our technical analysis and user feedback, phones with Qualcomm processors that support snapdragon sound can better support LDAC.

Snapdragon Sound includes high-bandwidth technology QHS and TrueWireless Mirroring technology.

QHS (Qualcomm High Speed) is Qualcomm’s new Bluetooth wireless transmission program. By modifying the Bluetooth protocol, and optimizing the modulation system, transmission of packet loss, and information integration, it maximizes the Bluetooth transmission bandwidth to up to 6Mbps, and the effective bandwidth to 1 ~ 1.2Mbps, so as to provide more space for audio transmission. Therefore, it can meet the high bit rate transmission of 990kbps of LDAC.

TrueWireless Mirroring technology solves the problem of traditional Bluetooth audio transmission technology that requires relay forwarding, which will occupy double the Bluetooth bandwidth.

Check out if your mobile phone supports Snapdragon Sound here:


If the device does not support Snapdragon Sound or the upgrade is unstable, it is suggested to revert the firmware

The current main problems with phones that do not support Snapdragon Sound are as follows:

(1) Do not support 990kbps bitrate;

(2) Stutter may occur when listening to music in LDAC adaptive mode;

(3) Muteness may occur when listening to music.

At this time, you can set the bitrate to 330kbps or 660kbps in the developer options to ensure the stability of audio playback. If there is still stutter or muteness, please hold the physical button with a raised dot on the earbud for about 8s, and then reset the two earbuds and reconnect them.

If the above measures still can not enable LDAC codec normally, please go to the Settings - Bluetooth code menu in the App to disable LDAC, or revert the firmware to the previously stable firmware.

We are very glad that we succeeded in improving the sound quality with LDAC for most TWS users, and also very guilty for not being able to solve the compatibility issue of LDAC for all connected devices. We promise we will keep working with Qualcomm and Sony to optimize the Bluetooth firmware and LDAC codec, trying our best to improve user experience.

Thank you so much for your support to FiiO! If you have any questions or suggestions about the firmware upgrade, please feel free to reach us out.

Updated at 2023-01-06

FW5 v1.26 download link: Click here

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

1. Added a new function of Bluetooth multipoint (can be connected to 2 Bluetooth devices at the same time); 

2. Added a new function of Bluetooth codec selection;

3. Added PEQ support (should upgrade the FiiO Control app to the latest version);

4. Added a new function of Bluetooth codec display on the app (should upgrade the FiiO Control app to the latest version);

5. Miscellaneous bug fixes.

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