You have a MediaTek CPU.
* Search for the correct cpu (I don't know if MT6517 exists)
* Search for root on mediatek devices which are compatible to your cpu or Search for root for your devices
* Search roms for your phone/hardware constellation
* (Probably give up)
You didn't do yourself a favor in buying a fake phone with a mediatek chip inside. It can and probably will be extremely hard to find something that matches your device and does not brick it.
I tried it once for a friend with a fake galaxy s4 mini and gave up because there were just chinese crap roms, not one AOSP one.
For me it's like that: Never ever buy any phone with mediatek in it. They're worse than apple in their policies and violate the GPL!
Anyways, I really hope for you that you find a suitable solution. If you find one, please post it here so it can be found with the search. Thanks!