Uninstall Google Pixel Edition?

Hi, I've just made the switch from an iPhone to the Nexus 6P. It's a great phone but I bought it with the Google Pixel interface and I want to know if it's possible to delete the whole thing and have the phone like it was out of the factory.

I'm running 7.1.1 and I can't update de security firmware because it goes through the "jailbreak" while rebooting and I don't know what to do (yet).

Thanks!