Help rooting Eonon GA2114 Android 4.4.4

Hello!
I want to root this head unit and I've seen this link but I got lost, so please help me.
Here is the head unit information
Manufacture: Eonon
Model: GA2114
http://eonon.com/Car-DVD-Players/And...VD/GA2114.html
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and this the system unit information
MCU Version: MTCB-KLD1-V2.55
Android Version: 4.4.4_28052015
Kernel Version: 3.0.36+ root@ubuntu #262
Build Number: rk3188-eng4.4.4 28052015
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Thanks