After spending a couple of hours seraching for solution I give up. I have a pair od QC35 II with the latest firmware 4.3.6, I'm having no troubles connecting them top my iPhone, but when it comes to laptop the problems begin to occur.
Basically until 5th of March I'd been able to pair and connect the headphones to my Dell XPS1370 without problems, then the windows update happened (6th of March, not sure if this has any connection to my problem though). I haven't tried to connect my QC35 to laptop since 5th of March, but now the conncetion won't work.
So far I've tried different combinations of:
- removing the "LE BOSE QC35 II" and "BOSE QC35 II" from laptop's device list
- cleaning the headphones' memory (or whatever holding the bluetooth switch for 10+ seconds does)
- reinstalling the bluetooth driver countless times (it's qualcomm qca61x4a v.10.0.0.709 currently)
- removing the BOSE connect app from my phone and reinstalling it
- changing headphones' name
All of that doesn't change the problem: whenever I'm searching for BT devices on my laptop, the only one that shows is LE-BOSE QC35 II. When I'm adding that one, it takes about 15 seconds for the system to install the drivers and then I'm getting the message that the device is ready to be used.
The headphones apper in audio section, but when I click "connect", nothing happens, or sometimes for a fraction of second the "connected" label appears, no reaction from the headphones nevertheless. Also during pairing I set the BOSE connect app to the pairing mode "ready to connect", and while the laptop says that the device is being paired, there's no reaction from the app.
This whole thing is extremely frustrating, I don't know if it's the laptop or headphones who cause the problem. Later on I'll try to connect to my friend's MacBook, I'll comment here about the result, but I'd be happy to hear some fresh ideas.