Root is in the firmware and all its components, if before flashing to wipe factory reset, ful reset and flash with Odin3 1.85, no problems ... Do not reinvent the wheel ...Wonder what use of this ROM then if one has to download original rom and flash. What a waste of time. I'd suggest op to remove download links to be hated less.
And do not put the custom kernel, and then do as you like...
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