SOLVED Bluetooth connection problem after W10 1903 upgrade


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I have a Bose headset used with a bluetooth dongle that has not worked since the upgrade to W10 1903. I have done all the items suggested in various Google hits and even Microsoft's Virtual Assistant. There are no newer drivers available for the dongle. I even purchased a new dongle and plugged it in and still no connection works. The Bluetooth USB Module entry in device manager has a cannot start code(10). Bluetooth is functional on the PC and shows the headset paired but that's all. When I try to connect from the sound settings I don't even see an error it just does not work. Things were working prior to W10 1903 upgrade and whatever updates were also installed at that time.
PC Acer Aspire TC-120
Windows 10 Home Version 1903
Headset Bose
Drivers are from Qualcomm 6/20/2018
Has anyone successfully gotten their Bluetooth stuff to work once it fails after W10 1903 upgrade?
 
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Also check the version of the USB ports, may need to assure using USB 2 [usually black center piece] rather than USB 3 [usually blue center piece].
 
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Are you sure you downloaded the right driver version for the Targus dongle.
Windows did it.

Tonight I tumbled to something that has bothered me since everything quit for my bluetooth headphones etc. In the event log there has been two entries every time I boot that are yellow triangles. One is saying the adapter does not support Low Energy mode. The other says there can only be one bluetooth adapter. My PC has a bluetooth setup without the dongle. Way back when I got the head phones the pairing worked and everything was ok until W10 1903. I wondered if W10 now does not support two bluetooth adapters. If it doesn't then maybe the headphones were orginially paired with the dongle and now it is not supported. I removed the paired headphones from the bluetooth screen and then did what was necessary to make the headphones broadcast their presents and added them back and bingo everything worked! I am sorry if I have wasted your time but thank you for investigating.
 

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