Ok, first check that you have the bootloader open, so connect the phone to the PC in fastboot mode and run the cmd.exe command and type fastboot oem device-info. If it gets true, open. If you have it open again install twrp 3.0.3.0 per adb. Wait for it to reboot, turn on twrp mode, and install superuser 2.79 stable. I have it and it works
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