Sony WH-1000XM4 Headphones
- Press the power button and the CUSTOM button simultaneously while charging.
- The headphones will reboot and all settings are retained.
- Turn off the headset while the USB Type-C cable is disconnected.
- Press and hold the power button and the CUSTOM button simultaneously for 7 seconds or more.
- The blue indicator flashes four times and the headset is completely reset.