Fix Hands-Free AG Audio low sound quality on headphones

After a Windows Update, my Sony WH-1000XM3 headphones didn’t seem to work correctly. I could only select Hands-Free AG Audio as audio device. The sound was horrible, noisy and mono.

Problem and symptoms

Before the update I used to have 2 audio-devices for my headset:

  • a stereo device for high quality Spotify, and a
  • handsfree headset device for Skype calls.

Afterwards, I only had one audio device: WH-1000XM3 Hands-Free AG Audio . Unfortunately, this device outputs low quality sound. Only useful for phone calls.

Solution for low sound quality on headphones

To fix the sound issues, I had to restore the working drivers in Windows. It sounds more complicated than it is. Here’s how:

  1. First, click Start -> type sigverif -> click on Sigverif Run Command
    open sigverif
  2. In the File Signature Verification window, click Start.
    The application scans the installed drivers for valid signatures. This may take a minute or three.
    sigverif start file signature verification
  3. Once completed, in the Signature Verification Results note the files that are not digitally signed. You should see your headphone drivers. The filenames may be cryptical like BtaMPM.sys and BthHfAud.sys (in case of Sony WH-1000XM3).
  4. Next, open a command prompt as administrator and type:
    DISM.exe /Online /Cleanup-image /Restorehealth
    This may take several minutes.
  5. Next, in the same command prompt type:
    sfc /scannow
    Wait until the verification is 100% completed.

Your headphones should now have 2 audio outputs on your computer: Stereo and Handsfree

handsfree and stereo headset jabra evolve 65

Run Sigverif again to check your drivers. It should now return no unsigned drivers.

More information can be found here:
System File Checker (SFC)

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I had the same problem. I removed my WH-1000XM3 in the bluetooth settings in Windows 10. After, I reconnected my headphones with my laptop.

Remember to set the headphones in pairing mode:
Ensure that the headphones are turned off. Then, touch and hold the power button for 4 seconds.

Rin Saunders

I have the same problem. I did this procedure. The unsigned files were difxapi.dll (logger) and opencl.dll (Apple utility). Still only have the AG headphone option.

Know of any further steps?


THANK YOU ! I was experiencing the same issue with my Taotronics BT-BH22 and it fixed it. I wonder why the driver was suddendly not signed anymore but now, it’s ok. I only had to deactivate and reactivate the bluetooth and Stereo profile was there again. :)

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