Sony WF-1000XM4 firmware update, version 1.4.2

Sony has released another firmware update for the WF-1000XM4. It includes the previous update (here) and some new changes.

• Improves the stability of music playback
• Improves call voice quality
• Improves general performance

 Previous benefits and improvements

• Improves the stability of Bluetooth connection and music playback
• Enhances other functions to improve general performance
• Improves Bluetooth connection stability
• Fixes an issue where the Noise Canceling function or Ambient Sound Mode is momentarily interrupted
• Improves other functions

Make sure both the phone and headset are fully charged before attempting the update. Sometimes the update fails if they are not fully charged in certain instances.