Bose QC35 II headphones have been updated with support for Amazon Alexa- Technology News, Firstpost
Bose Now Lets You Downgrade Firmware of QC 35 If You're Facing ANC Issues | Beebom
Bose QuietComfort 35 II vs Bose QuietComfort 45 - SoundGuys
Did Bose QuietComfort 35 firmware upgrade make headphones sound worse? - CNET
Bose QuietComfort 35 II Noise Cancelling Bluetooth Headphones - Wireless, Over Ear Headphones with Built in Microphone and Alexa Voice Control, Black, Standard Headphone Size: Amazon.co.uk: Electronics & Photo
Bose shouts down claims that it borked noise cancellation firmware to sell more headphones • The Register
Checking the software or firmware version - QuietComfort 35 wireless headphones II