Hey guys.
I got an MK-888.

I am trying to root the device, but I just can't select USB Debugging mode.
I go to developer options, and check the box for usb debugging.
Then whenever i do another selection, or close and re-open settings, the USB Debugging is unchecked.

Any idea on how to fix that? It's driving me crazy. I am trying to root for 2 hours now and I just can't do it!