@d-air1 So i bought the tp-link 5.0, put it into my computer, worked. I still can’t pair with bluedevil, the connection fails at the first try, but when I reboot afterward it connects just fine. And the rest of the story will be back in the other thread.
! Do not buy a Bluetooth dongle with a ATS2851 chip, like the Urgreen 5.3!