People.Use Eu. Rom. Flash TWRP, flash magisk, use gfix. That's all, Not so difficult, belive me. My 14 years old son doing this in 15 minutes. Really. Good luck and grettings fot EU. rom developers. 
You
can use LSposed, Lucky patcher miuicustomizer, Chimi. 
Just follow procedur and tutorials. That's All
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You
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Just follow procedur and tutorials. That's All