INZONE H9 II – Sound Delay, Color Mismatch, or Serial Number Not Displayed

If you experience issues with your INZONE H9 II headphones—such as sound not playing at the start, incorrect color shown in the Sony | Sound Connect app, or the serial number not appearing on your smartphone—these problems can be resolved by updating the headphones to the latest firmware.

Update Your INZONE H9 II (Recommended First Step)

These issues occur when the headphones are running outdated firmware. To update:

1. Connect your INZONE H9 II to a computer.
2. Open INZONE Hub (Download here)
3. Install the latest firmware update.

After updating, check whether your issue is resolved. If not, follow the additional steps in the relevant section below.

1. Sound Does Not Play at the Beginning of Game Audio or Music

You may notice that sound is missing or delayed:

• When game audio or music starts after a period of silence.
• When switching from one connected smartphone to another.

Solution:

Update the firmware using the INZONE Hub.
This resolves the audio initialization delay.

2. Color in Sony | Sound Connect App Does Not Match the Headphones

If the app displays a color different from the actual color of your INZONE H9 II:

Try the following:

• Update the firmware using the INZONE Hub.
• If you use an iPhone:
  1. Remove the existing INZONE H9 II registration from the Sony | Sound Connect app.
  2. Register the headphones again.

This refreshes the configuration data and applies the correct color information.

3. Serial Number Is Not Displayed on the Smartphone

If your smartphone shows no serial number for the INZONE H9 II:

Solution:

Update the headphones to the latest firmware using INZONE Hub.
The update restores correct serial number visibility in supported apps.

Summary

The following INZONE H9 II issues—including audio starting late, incorrect color display, or missing serial numbers—are caused by outdated firmware. Updating your headphones through the INZONE Hub resolves these symptoms in a single step. iPhone users may also need to re-register the headphones in the Sony | Sound Connect app.