Instructions on how to use the USB device port of your ODROID-U3 to communicate with your PC.
ie see your board from your PC like an USB device.
You can connect your ODROID-U3 to your PC using its USB Device port, and it can be
“enumerated” as most common USB devices (depending on the type of communication you want to use)
Refer the article in the ODROID-Magazine 2014 Feb issue too.
Magazine