After a `adb reboot-bootloader`, output of `dmesg`:  
```
usb 1-2: USB disconnect, device number 76
rndis_host 1-2:1.0 usb0: unregister 'rndis_host' usb-0000:00:15.0-2, RNDIS device
usb 1-2: new high-speed USB device number 77 using xhci_hcd
usb 1-2: New USB device found, idVendor=18d1, idProduct=d00d, bcdDevice= 1.00
usb 1-2: New USB device strings: Mfr=1, Product=2, SerialNumber=3
usb 1-2: Product: Android
usb 1-2: Manufacturer: Google
usb 1-2: SerialNumber: 8a221a8
```