Root Issue of OP PC Plus

Xnadoo

Sir,
I am using OP PC Plus with Android OS (Downloaded from Download link of OP site) on SD card. Its running , but the Device is not rooted. If I try to get it rooted with Kings root , with Many attempts , I have been able to do it upto 55%
1. Is there any easy way to make it a rooted device.
2. Is there any Pre rooted Android image available.

Thanks in adance

regards

Xnadoo