Set warranty bit : recovery

A

AC Question

Hi. So I'm trying to root my GALAXY NOTE 4 (T-MOBILE). It was previos Lynn rooted, but with the new update, I check using root checker & says root not properly installed. I open the supersu app (which i got from Google store) and says no binary installed. I tried installing a small .md5 file using odin and after 1st restart my phone is stuck at "Booter loading..., something* not seandroid encorfed, set warranty bit : recovery". Note: my knox was tripped BEFORE i tried doing that. So basicly i installed stock rom again. I Want to re-root. what should i do? ty