External Bluetooth USB Adapter

I was trying to make my Rpi4 + HFBAmp4 work with an external USB Bluetooth for better coverage.

It just doesn't work. When I connect the usb bt adapter, the pairing button doesn't work nor does the bluetooth in general.

It should be supported now based on the changelog (months ago) but there's no documentation nor article that I was able to find.

I tried with several unbranded usb sticks and 'more reputable' tplink. All BT 5.X


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