Bose Lets Users Downgrade QC35 Firmware After Months of Complaints
My new Bose Qc 35 II. I have tested both this and sony XM4 and gone with Qc35II.So much happy specially with 4.8.1 firmware. I wonder it is competing with 2020 XM4
Bose Adds Adjustable ANC to the QC35 | by Alex Rowe | Medium
Checking the software or firmware version - QuietComfort 35 wireless headphones II