![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 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](https://preview.redd.it/duvazevrqee61.jpg?auto=webp&s=451592e7dbcc2120f313bfacebd0855e74d87486)
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 fends off claims 'noise cancellation-breaking' firmware update was intended for sly sales boost | ZDNET Bose fends off claims 'noise cancellation-breaking' firmware update was intended for sly sales boost | ZDNET](https://www.zdnet.com/a/img/resize/5a61a67a653fef4b1ca4858bd852e7abc30f7630/2019/07/24/771da80a-48a5-42a5-93f9-5f0801c9ba5d/bose-headphones.jpg?auto=webp&fit=crop&height=900&width=1200)
Bose fends off claims 'noise cancellation-breaking' firmware update was intended for sly sales boost | ZDNET
![Downgrade your Bose QuietComfort 35 II from any version to 4.3.6, 4.1.3, 3.1.8, 3.1.7, 2.5.1, 2.2.1, 2.2.0, 2.1.3 or 2.0.1 : r/bose Downgrade your Bose QuietComfort 35 II from any version to 4.3.6, 4.1.3, 3.1.8, 3.1.7, 2.5.1, 2.2.1, 2.2.0, 2.1.3 or 2.0.1 : r/bose](https://preview.redd.it/iepygxkmk6q31.png?width=2838&format=png&auto=webp&s=cb2258be55bdcd1407295b16ae012a41a58ff128)
Downgrade your Bose QuietComfort 35 II from any version to 4.3.6, 4.1.3, 3.1.8, 3.1.7, 2.5.1, 2.2.1, 2.2.0, 2.1.3 or 2.0.1 : r/bose
![Bose QuietComfort 35: Firmware-Update soll ANC-Qualität doch nicht beeinträchtigt haben - Notebookcheck.com News Bose QuietComfort 35: Firmware-Update soll ANC-Qualität doch nicht beeinträchtigt haben - Notebookcheck.com News](https://www.notebookcheck.com/fileadmin/Notebooks/News/_nc3/Bose.jpg)