To actually know what is the USB number to use in the commands I linked above you should use dmesg command to see what is the number of the USB device.
For example if I wanted to reset the USB connection of my phone (usb tethering to the router), see the dmesg after I connect it (only relevant part shown, at the end of the text)
[335626.455920] usb 1-1.4.4: new high-speed USB device number 38 using orion-ehci
[335629.230934] usb 1-1.4.4: USB disconnect, device number 38
[335629.586051] usb 1-1.4.4: new high-speed USB device number 39 using orion-ehci
[335629.761896] rndis_host 1-1.4.4:1.0 usb0: register 'rndis_host' at usb-f1050000.ehci-1.4.4, RNDIS device, e2:e2:18:fe:3c:5b
its number is 1-1.4.4
I would need to write
echo "1-1.4.4" > /sys/bus/usb/drivers/usb/unbind
echo "1-1.4.4" > /sys/bus/usb/drivers/usb/bind