How to downgrade your Bose QuietComfort 35 I from 3.0.3 to 2.5.5 : r/bose
How to fix problems with Bose QuietComfort 35 II - SoundGuys
Amazon.com: Replacement QC35 / QC35 ii earpads and QC35 Headband / QC35 ii Headband V3 pad Cushion Compatible with Bose QuietComfort 35 (QC35) and Bose QuietComfort 35 ii (QC35 ii) Headphones (Black) : Electronics
Bose Now Lets You Downgrade Firmware of QC 35 If You're Facing ANC Issues | Beebom