If you want to boot the ODROID-C2 via otg port, please using 5V/2A adapter.
OTG booting is unstable in some environment.
Most features are described in here
This page describes the use of the OTG port.
OTG Booting
The ODROID-C2 can be powered by not only DC jack, but also OTG port.
Before using a OTG port, you should check your ODROID-C2 header pin J1.
As you can see, when you want to power the ODROID-C2 via the OTG port, you have to plug the J1 jumper.
If the J1 jumper is not connected, the OTG port can't be used for the power input.
OTG port & DC jack
But when you connect ODROID-C2 to the DC jack and the OTG port together, and ODROID-C2 be powered via DC jack, you must remove the J1 jumper!
Otherwise, your C2 board can be damaged.
So you should disconnect J1 pins like the above picture.
