Browse the SD card for the SuperSU file.Choose the ‘flash zip from SD card’ option.Now that you have a custom recovery installed, choose the ‘Install’ option from the main recovery menu.
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Learn how to install a custom recovery on the Google Nexus 6P smartphone.Unplug the Google Nexus 6P from the computer.Copy and paste the SuperSU file from the desktop to the internal SD card on the smartphone.Connect the Google Nexus 6P to the computer.Download the updated version of SuperSU to your computer from this link.HOW TO ROOT GOOGLE NEXUS 6P ON ANDROID 6.0 MARSHMALLOW Flashing a stock ROM and recovery on your Nexus should help getting that done.
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You’ll need to unroot and remove the custom recovery if you want to send it away for free repairs under warranty.