Did Bose QuietComfort 35 firmware upgrade make headphones sound worse? - CNET
How do I update my Bose Wireless Headphones?
How to downgrade your Bose QuietComfort 35 II from 4.5.2 to 3.1.8 : r/bose
Optimum Teco guides - Bose QC35 noise cancelling was gimped by recent software update, claim owners Both generations of Bose's QuietComfort 35 headphones have long been some of the most popular noise-cancelling