EPD by pervasivedisplays Partial update

Hey there folks, I am trying to figure out how to partially update the EPD by Pervasive displays. The module is this one:

http://www.pervasivedisplays.com/kits/ext_kit

I am using an Arduino Mega 2560 to control the EPD.

And I am looking for something like this:

https://www.youtube.com/watch?v=enzUbiSWenQ

Thanks a lot in advance.