For anyone who is still trying to figure it out how to play with Matirx, the YouTube Video guides below might be helpful
Unboxing and First Look:
http://www.youtube.com/watch?v=oTRIhWl9uDo&feature=youtu.be
How to Install Ubuntu, Android 4.2.2 - Step-by-Step Guide:
http://www.youtube.com/watch?v=NE3pVgBdDm4&feature=youtu.be