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That method is not new.If you can read Chinese and are not afraid to take risks, there's root info for the Max Pro here.
http://jingyan.baidu.com/article/3052f5a1f9d77497f21f8662.html
It will not. Not a popular phone for dev work. Buy Nexus, LG, HTC or Samsung for root friendly devices. I love my LG Stylo 2 Plus rooted. I have gyroscope,nfc,stylus pen and running on a stock Deodex rom. I sold my zte zmax pro back in August of 2016. I knew root will never come to this phone.Anyone else feel like this phone is unrootable? I've waited a long time for root to come to this phone but I am ready to throw in the towel and just get a phone that can be rooted. Do you think this phone will ever get root?
^^^See here. One meandering discussion that continuosly goes off topic is enough.73 pages of discussion about it here
https://androidforums.com/threads/zte-zmax-pro-official-root-discussion.1110550/page-72#post-7526980