(TWRP is working and you're not encrypted) Flash the zip with TWRP directly

(Your device is encrypted, and want to stay encrypted) TWRP will enter a loop. Wait for a while and it will boot eventually, then use adb sideload to flash the zip.

(Your device is encrypted, and you want to decrypt, or TWRP is not working for you) Extract the zip, flash the boot.img for your device through fastboot, then revert to stock recovery. Then do a "Factory Reset" to wipe everything. Now you are decrypted can use TWRP normally.

Supports Nexus 9, 6P, 6, and 5X

Disabled force-encryption (encrypted users can still use it with no problems)

BusyBox is pre-installed as well.

Hello everyoneI believe many people cannot wait to use the latest Android N Preview on their Nexus devices, but found out that root still isn't available. The first root method appears HERE , done by @ phhusson If people wanted to use SuperSU for some reason, I created this small flashable zip.Based on nearly the same thoughts but combined with @ Chainfire systemless method, this root is also done by setting SELinux to PERMISSIVE.The zip comes with aroma installer, so you can choose your device within the menu.Instructions:Features:Tested on my Nexus 9, Screenshot: