Sony Wh-1000xm4 Firmware 2.5.1 Link Updated -

Sony rolls out updates in waves by region (Japan first, EU last). You can force the update by changing your Play Store region via VPN, but the easier route is to wait 1-2 weeks.

If the update fails, do not reset the headphones immediately. Simply restart the app and the headset, then try the process again. The update will typically resume from where it left off. Sony Wh-1000xm4 Firmware 2.5.1 LINK

To access the firmware, you must use the official Sony support channels. The is essentially the Sony Support page or the App Store/Play Store link for the companion app. Sony rolls out updates in waves by region