How to root nexus 6 with android N

I have lot of issues with android N(not complaining). I have tried to un enroll in beta program. But i am not getting any update notification(marshmallow update). I have tried to enroll and un enroll but i am not getting any update. I am trying to root the phone. But oem unlock option is greyed out. So i cant unlock bootloader. All possibilities are blocked. Please help me with any posibility.
Thank you!!!

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