IMPORTANT: This file is only for use with the models identified. Not all models are sold in all countries/regions.

Required Downloads

About this download

Benefits and Improvements

• Fixes an issue where the headphones would reboot during music playback under specific conditions
• Improves other functions
  Note: To prevent firmware download issues, do not use apps that play music or audio during updates.

Previous Benefits and Improvements

The following benefits and improvements are also included in this update.

• Fixes an issue where the headphones will occasionally not turn on
• Improves call quality
• Improves general functions

System Requirements

• An Android device (V9.0 or later) or an iPhone (iOS 15.0 or later)
• An active Internet connection
• The latest version of the Sony | Headphones Connect application must be installed
• The headphones must be connected to your Android or iPhone

File Info

• Name: Firmware update 1.0.9 for WH-CH720N
• Version: Version 1.0.9
• Size: 1.56 MB (1 637 680 bytes)
• Release Date: 08-07-2024

Preparation

Check the firmware version

You can check the firmware version as follows.

1. Launch the Sony | Headphones Connect app.
2. Connect your headphones to the Sony | Headphones Connect app.
3. Press the three dots (Menu button) in the upper right corner.
   
   Note: The device displayed on the screen depends on the device connected.
4. Select the Version of your device shown in the Menu. This will only be shown when the device is connected.
5. Confirm the firmware version.

Important Notice

• Do not charge the battery or turn off your headphones while downloading updates, transferring data, or updating. Doing so may cause the headphones to become unusable.
  
• Do not perform the update in a location where the Wi-Fi signal is inconsistent, such as on a train, in a place where Wi-Fi signals become congested, or near a microwave, cordless phone, or any other devices that use the 2.4 GHz band frequency radio waves.
• Make sure both devices (Android or iPhone and the headphones) are fully charged.
• Disconnect all other Bluetooth devices such as wearable devices or smart watches from your Android or iPhone before starting the update.

Before you upgrade

• After updating, the firmware cannot be reverted to an earlier version.
• The update process will take approximately 20 minutes to complete. The file size is about 1.56 MB.
• For iPhones, make sure to turn off the Google Assistant function prior to the update.
• Depending on the radio wave environment and your Android or iPhone, it may take longer to complete.

Download & Install

To update the headphones, follow the procedure below:

1. Download data from the server to the Android or iPhone.
2. Transfer data from the Android or iPhone to the headphones.
3. Execute the update with the headphones.

Step 1: Install the update

1. Launch the Sony | Headphones Connect app.
2. Connect your headphones to the Sony | Headphones Connect app.
   • If you have never connected to the Sony | Headphones Connect app before, follow the instructions on the screen to connect with headphones to your Android device.
   • If you have connected to the Sony | Headphones Connect app before, select your headphones.
3. The Dashboard screen will be shown when the connection has been established.
   
4. If an update is applicable, the message Headphone update available will be displayed, and you can press More Info.
   
5. Verify that Version 1.0.9 is displayed and press OK to start the update.
   
6. Once the download starts, it will automatically move to the next screen after the download is completed.
   Note: When the message [Bluetooth Pairing Request] is displayed, press Pair. The update will resume. (Only for iPhones).
7. The transfer starts. It will automatically move to the next screen after the download has been completed.
8. Once the transfer starts, it will automatically move to the next screen after the transfer has been completed. This will take approximately three minutes.
   Note: Do not charge the battery or turn off your headphones while downloading updates, transferring data, or updating. Doing so may cause the headphones to become unusable. If a disconnection message is displayed, wait until it automatically reconnects.
9. When the software update is completed, press OK.
   Note: If the screen is not displayed, check whether the version has been upgraded in the following step.
   

Step 2: Check the update was successful

After the update, confirm that the new version has been installed successfully by following the steps in the Check the firmware version section. If the firmware version shown is 1.0.9, the upgrade was successful.

Questions & Answers

An update error message appears.

1. Press OK.
2. Restart the headphones (turn the power off then on).
3. After that, restart the Sony | Headphones Connect app and update again.

Even though the update failed during the process, check the firmware version. If the Version is shown as 1.0.9, the firmware update was successful. If not, try the firmware update again. You can check the version from the setting in the Sony | Headphones Connect app. To find out how to check the version, go to Check the firmware version on this page.