A couple of years ago I bought a C2 and it still hasn't progressed beyond the 3.14 kernel required by the versions of Android Samsung was shipping on phones using that chip[1]. Also, getting the display working correctly with a monitor attached via an HDMI to DVI-D cable was obnoxious (again reflecting the CPU's Android heritage - hardware expects to be told exactly what's attached and doesn't try to detect anything).
[1]: https://wiki.odroid.com/odroid-c2/software/building_kernel