Want to revert back to stock miui

I have a RN3SD device, I have had a full backup(6.5.19global developer rom) via Alka TWRP. I have officially unlocked my device,and now I am on unofficial RR rom. By the way, I have closed boot.img verify through TWRP.

How can I revert back to stock global rom, and root it. using xposed and viper4android?:confused:

THanks!:fingers-crossed:

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