Bose QC35 II owners complain of degraded noise cancellation after recent updates - The Verge
How to downgrade your Bose QC35 / QC35 II with firmware 3.0.3 / 4.5.2 - YouTube
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How to fix problems with Bose QuietComfort 35 II - SoundGuys
Amazon.com: Bose QuietComfort 35 II Noise Cancelling Bluetooth Headphones— Wireless, Over Ear Headphones with Built in Microphone and Alexa Voice Control, Silver : Electronics