Bose fends off claims 'noise cancellation-breaking' firmware update was intended for sly sales boost | ZDNET
QC35 series 2 - Did bose ever resolve the firmware update/anc issue? : r/ bose
Amazon.com: Bose QuietComfort 35 II Noise Cancelling Bluetooth Headphones— Wireless, Over Ear Headphones with Built in Microphone and Alexa Voice Control, Silver : Electronics
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Bose QC35 II owners complain of degraded noise cancellation after recent updates - The Verge