Sony WF-1000XM4 Version 2.0.0 is out! This software update adds simultaneous connection of 2 devices to the headphones : r/sony

Connect the headphones to two devices simultaneously (multipoint connection)

Sony finally adds Bluetooth Multipoint to the WF-1000XM4

Bowers & Wilkins Px8 Wireless Review

Sony WF-1000XM4 earbuds update adds multipoint Bluetooth connectivity

WF-1000XM4, Help Guide

WF-1000XM4 Software Update Available from Jan 11, 2022 : r/SonyHeadphones

Firmware Update to Version 2.0.0

Sony WF-1000XM4 Truly Wireless Noise Cancelling Headphone - Optimised for Alexa and Google Assistant - with Built-in mic for Calls - Bluetooth Connection - Black/Copper : Electronics

Sony WF-1000XM4 earbuds on firmware 1.5.0? Wasn't 1.4.2 the latest firmware? : r/SonyHeadphones