QC35 II firmware upgrade lost connection at 28% using Bose Updater & USB cable
I started an upgrade of the firmware because the audio stream over the bluetooth connection was skipping.
I downloaded the Bose Updater software from btu.bose.com, installed the software (Laptop with Windows 10 1909 Build 18363.836).
I connected the headphones via USB to the laptop and the btu.bose.com webpage recognised the headphones and offered an "Upgrade" button to go up to 4.5.2 (I do not know what version they were on).
The progress bar got to 28%, halted for about 5 seconds, then a window popped up that said "Oops... We lost connection to your product. Try unplugging your product then plugging it back in" Under this was a button labelled "Try Again"
At no time was power lost. At no time were the headphones unplugged, nor the USB connectors or cables touched or moved.
I followed the instructions of unplugging and plugging in again, then pressed the "Try Again" button. This time the same error popped up at the 10% mark. This happened everytime I retried. I rebooted my laptop and tried again. The same pattern of failure resumed with first failing at 28% and the successively at 10% until rebooted.
I tried on a second laptop I have with exactly the same results. I then tried on two different desktops (one running Windows 10 and another running Windows 7 - with the exact same results.
I have tried different browsers as well (MS Edge Beta, Internet Explorer, Google Chrome), all with the same results.
The bluetooth function of the headphones is inoperable. I can turn the headphones on but I cannot trigger the bluetooth polling function - in the headphones the only sound that is made if I hold the bluetooth button across to the right is the same jingle that is played when you first turn the headphones on.
I believe that the headphones firmware update has wrecked the headphones usability, although I hope I am wrong.
Can anyone help?