VM kernel for Bluetooth connectivity

[89721]

I used to pass through my USB Bluetooth adapter to a suitable VM. 

I noticed that only a few kernels I had installed worked for me. Currently I only get a failed pairing and then `Failed to pair: org.bluez.Error.AlreadyExists` when trying to pair again and when connecting `Failed to connect: org.bluez.Error.Failed`.

I have troubleshooted endlessly and concluded that the kernel used is the issue here.

I think it was one of the 5.5.x kernels that worked, which are gone now after an upgrade removed some of them.

I have tested all my currently installed kernels and none of them work. The installed kernels are:

5.6.16-1

5.6.15-2

5.6.13-1

5.6.10-1

5.5.9-1

4.19.125-1

4.19.113-1

4.19.110-1

So it is none of these.

Do you know which one it is? And how do I install these older kernels?