You can now root this phone. Has been available for a few months. This is for just in case somebody is still interested. And it's free of charge there is no need to use uni.tool. which is a paid app.https://www.google.com/amp/s/forum.xda-developers.com/zte-zmax/how-to/zmax-pro-free-twrp-root-method-t3767821/amp/. I have tried it and rooted several of them without any problems. Please follow the directions.