How to downgrade your Bose QuietComfort 35 II from 4.5.2 to 3.1.8 : r/bose
Bose fends off claims 'noise cancellation-breaking' firmware update was intended for sly sales boost | ZDNet
Help] Am I on 4.5.2 or 4.1.3 : r/bose
Bose QuietComfort 35: Firmware-Update soll ANC-Qualität doch nicht beeinträchtigt haben - Notebookcheck.com News
How to fix problems with Bose QuietComfort 35 II - SoundGuys
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Bose disproves conspiracy theories regarding reduced noise canceling performance with QC 35 II update - GSMArena.com news