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

Notice Before Updating

About This Download

Benefits and Improvements

• Improves secure communication

Previous Benefits and Improvements

System Requirements

• An Android device (Ver. 9.0 or later) or an iPhone/iPad (iOS Ver. 15.0 or later)
• An active Internet connection
• The latest version of the Sony | Music Center app must be installed
• The speaker must be connected to your Android device or iPhone/iPad

File Info

• Name for ULT FIELD 1: Firmware update to 3400 for SRS-ULT10 / ULT FIELD 1
• Name for ULT FIELD 7: Firmware update to 3000 for SRS-ULT70 / ULT FIELD 7
• Name for ULT TOWER 10: Firmware update to 5000 for SRS-ULT1000 / ULT TOWER 10
• Version for ULT FIELD 1: 3400
• Version for ULT FIELD 7: 3000
• Version for ULT TOWER 10: 5000
• Size for ULT FIELD 1: 1.40 MB (1 475 696 bytes)
• Size for ULT FIELD 7: 1.49 MB (1 565 200 bytes)
• Size for ULT TOWER 10: 1.72 MB (1 806 848 bytes)
• Release Date: 18-12-2025

Preparation

Check the Firmware Version

If the version is displayed 3300 or lower (ULT FIELD 1), 2900 or lower (ULT FIELD 7), 4900 or lower (ULT TOWER 10), we strongly recommend updating the firmware. If you're not sure, it's easy to check which version of the firmware you currently have:

1. Turn on the speaker.
2. Launch the Sony | Music Center app.
3. Connect your speaker to the Sony | Music Center app.
4. Select Settings.
5. Select System.
6. Confirm the firmware version.
   

Important Notice

• Do not turn off your speaker while downloading updates, transferring data, or updating the firmware. Doing so may cause the speaker to stop working.
• 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 your Android device or iPhone/iPad and speaker are fully charged.
• Make sure your speaker is connected to a power outlet via the USB AC adapter (ULT FIELD 1) or AC power cord (ULT FIELD 7, ULT TOWER 10) before starting the update.
• Disconnect all other Bluetooth devices such as wearable devices or smartwatches from your Android device or iPhone/iPad before starting the update.

Before You Upgrade

• After updating, the firmware cannot be reverted to an earlier version.
• For Android devices, the update process will take approximately 5 minutes (ULT FIELD 1, ULT FIELD 7, ULT TOWER 10) to complete.
• For iPhone/iPad, the update process will take approximately 10 minutes (ULT FIELD 1, ULT FIELD 7) or 11 minutes (ULT TOWER 10) to complete.
• Depending on the radio wave environment and your Android device or iPhone/iPad, it may take longer to complete.

Download & Install

To Update the Speaker, Follow the Procedure Below:

1. Download the data from the server to your Android device or iPhone/iPad.
2. Transfer the data from your Android device or iPhone/iPad to the speaker.
3. Complete the update using the speaker.

Step 1: Install the Update

1. Connect to a power supply outlet.
   • ULT FIELD 1
     Use the USB AC adapter and supplied USB Type-C® cable to connect the unit's DC IN 5 V port to a power outlet.
   • ULT FIELD 7, ULT TOWER 10
     Connect the speaker to an AC outlet using the supplied AC power cord.
   Note: The software update cannot be performed when using battery power only.
2. Turn on the speaker (ULT FIELD 1, ULT FIELD 7).
   Turn on the speaker and wireless microphone (ULT TOWER 10).
3. Launch the Sony | Music Center app.
4. Connect your speaker to the Sony | Music Center app.
5. The following screen will be shown when the connection has been established.
   If an update is applicable, an “Update the software of the speaker.” message will be displayed. Press More info to proceed.
   
6. Verify that Version 3400 (ULT FIELD 1), 3000 (ULT FIELD 7), or 5000 (ULT TOWER 10) is displayed, then press OK to start the update.
   
7. Once the download starts, the next screen will automatically appear after the download is completed.
8. Once the transfer starts, the next screen will automatically appear after the transfer is completed.
   Note: Do not turn off your speakers while downloading updates, transferring data, or updating the software. Otherwise, the speakers may stop working.
9. When the software update is completed, press OK.
   
10. If the screen is not displayed, check whether the version has been upgraded in the Step 2: Check the Update Was Successful section below.
11. The speaker automatically turns off when the software update ends.

Step 2: Check the Update Was Successful

After the update, confirm that the new version has been installed successfully by following the Check the Firmware Version section steps.
If the firmware version shown is 3400 (ULT FIELD 1), 3000 (ULT FIELD 7), or 5000 (ULT TOWER 10), the upgrade was successful.

Questions & Answers

An update error message appears

Follow these steps:

1. Press OK.
2. Restart the speaker (turn the power off and then on).
3. After restarting the speaker, restart the Sony | Music Center app, then try the update again.

Even though the update failed during the process, check the firmware version. If the version shown is 3400 (ULT FIELD 1), 3000 (ULT FIELD 7), or 5000 (ULT TOWER 10), the firmware update was successful. If not, try the firmware update again. You can check the version from the settings in the Sony | Music Center app. To find out how to check the version, go to the Check the Firmware Version section on this page.