Currently I'm using my "HTC Desire HD" phone for the internet connection via USB tethering with my "MikroTik RB2011UiAS-2HnD-IN" router. I've plugged it in and everything worked fine. When I remove the phone and plug it in again it will not work anymore.

- it's not listed under "Interfaces" in Winbox
- on "IP > DHCP Client" an old entry with "unknown"-Device is listed

If I restore the backup which I have created during the running configuration it will work again.

In both cases the device is listed in the
/system resource usb print
output

the USB port might be stuck in the Device mode maybe. Please power off the board and then attach the phone and only then power on the board.