[HELP!] How do I root I-mobile IQ II?

Okay I an current trying to root I mobile IQ II but keep getting stucked on boot loop. I already installed TWRP 2.8.7.0 for i mobile and was able to get the device back to working condition. After 5 hours of work I still can't root the device with the methods on the internet so I am here asking for help. Please reply ASAP as I want to root this device.

I am currently running Android Marshmallow on the device.

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