I recently installed Resurrection Remix 5.8.5 Custom Rom by @SaberShip based on Android 7.1.2 which came with root access enabled and supersu installed by default. So I tried to unroot by flashing unsu.zip by @osm0sis through twrp recovery. After that I checked using Root Beer Sample app but my device was still showing up as rooted. It fails the dangerous build.prop and selinux flag tests. I need to unroot for using an education app which doesn't run on rooted devices.