I added root for Android N previews.. This is a PERMISSIVE root. Google broke sepolicy file format without changing version. This is most likely a bug of this version, I'm waiting for the AOSP sources update to confirm.As a remainder, download the su-eng img matching your device and the build on https://superuser.phh.me/nexus/ Then fastboot flash boot itInstall phh's Superuser from Play StoreAnd enjoy!