Like most other Google Nexus devices, the Google Nexus 6 has been treated to the Android N Developer Preview before any other smartphone out there that runs on Android. Since these are Google’s own devices, they get looked after before the rest. Android N has a lot in common with Android Marshmallow and the version of the SuperSU for Android N should remain a systemless root version which no longer requires needing to change anything in the /system partition. Chainfire made this prediction a whole ago, and it does not appear as though much has changed.
- You must have a custom recovery installed on the Google Nexus 6 smartphone  before they can follow this guide to root it running on the Android N Developer Preview. Any custom recovery works for this job, but as usual, we direct people through to the best.
- You need to have a computer to download the SuperSU application which is then transferred over to the internal storage SD card folder of the smartphone.
BEFORE WE BEGIN
- We recommend users backup the Google Nexus 6 smartphone by taking the NANDroid Backup option from within the custom recovery partition after booting it into the recovery when following the guide. Those who do not enjoy taking NANDroid Backups can backup any way they like, including the Helium app from the Google Play Store. Helium is as good as it gets before users have a rooted device that can run the Titanium Backup application.
- Note that rooting the Google Nexus 6 smartphone and installing a custom recovery if people have not got one already does void the warranty. Moreover, unlocking the bootloader voids the warranty also, and people need to unlock the bootloader before they can install a custom recovery image on the smartphone.
HOW TO ROOT GOOGLE NEXUS 6 RUNNING ON ANDROID N NPD56N DEVELOPER PREVIEW 4
- Download the SuperSU 2.71  directly on the computer.
- Connect the Google Nexus 6 smartphone to the PC by suing the USB cable.
- Copy the SuperSU version 2.71 Beta to the internal storage SD card folder and then unplug the phone from the computer when it is done.
- Boot the Google Nexus 6 smartphone into the custom recovery mode  by holding down the keys for the stock recovery mode.
- Look for the backup button and press it from the main recovery menu if people want to take the NANDroid Backup at this point. Otherwise, skip to the next step.
- Tap on the Install button from the main recovery menu and then browse through to the SD card and choose to upload the SuperSU 2.71 zip file and install it by following the guidelines on the display.
Once the SuperSU 2.71 is installed, select the option for rebooting the system, and the Google Nexus 6 smartphone reboots back into the normal mode.
In conclusion, that is how to root Google Nexus 6 smartphones when they are running on the Android N NPD56N Developer Preview 4 software updates by taking advantage of a custom recovery and Chainfire’s SuperSU. The Nexus 6 reboots back into the normal mode now, and it has the SuperSU app installed and enabled and is visible from the app drawer. That means people can tap on the Google Play Store application and choose to download any of the apps that require root access before they can run. Once the selection is made from the Play Store, and you download the app, you then need to open it up and confirm you wish to give it root access when the SuperSU app prompts about it on the screen. Conversely, make sure not to give root access to any apps that users do not remember downloading or that don’t seem trustworthy. SuperSU is powerful enough to stop everything in its path, but if people choose to allow something through then it lets it through regardless of what it is, and that is how some people end up with malware.