Ok, I tried again but changed the command with the version above to:

make SUBLEVEL=0 EXTRAVERSION=-46-generic modules_prepare

Now I get in dmesg:

[ 7851.540982] usb 10-1: new full-speed USB device number 4 using xhci_hcd
[ 7851.788016] usb 10-1: New USB device found, idVendor=0a12, idProduct=0001, 
bcdDevice=88.91
[ 7851.788022] usb 10-1: New USB device strings: Mfr=0, Product=2, 
SerialNumber=0
[ 7851.788026] usb 10-1: Product: CSR8510 A10
[ 7851.802391] usbcore: registered new interface driver btusb
[ 7851.963660] Bluetooth: BNEP (Ethernet Emulation) ver 1.3
[ 7851.963662] Bluetooth: BNEP filters: protocol multicast
[ 7851.963667] Bluetooth: BNEP socket layer initialized
[ 7853.817073] Bluetooth: hci0: command 0x1001 tx timeout
[ 7861.977389] Bluetooth: hci0: CSR: Local version failed (-110)

seb@eragon:~/btDongleTest/linux-source-5.3.0[0]$ hciconfig 
hci0:   Type: Primary  Bus: USB
        BD Address: 00:00:00:00:00:00  ACL MTU: 0:0  SCO MTU: 0:0
        DOWN 
        RX bytes:0 acl:0 sco:0 events:0 errors:0
        TX bytes:0 acl:0 sco:0 commands:1 errors:1

seb@eragon:~/btDongleTest/linux-source-5.3.0[1]$ sudo hciconfig hci0 reset
Can't init device hci0: Connection timed out (110)


Otherwise behaviour is unchanged.

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https://bugs.launchpad.net/bugs/1873718

Title:
  CSR8510 based BTA-402 Bluetooth device cannot be started

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