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The easiest way to install a stock image on a Nexus device is still the Wugfresh Nexus Root Toolkit. Grab the toolkit from the link below. Grab the stock image for Marshmallow Developer Preview 3 from the link below. You will want to go into settings and chose your current device and build. Be sure that your device is in USB debugging mode (turn on the option in developer settings). Then chose the option to "Flash Stock + Unroot". Do this as "device on/normal". It will ask you which image you want to flash, select browse PC, find the stock image you just downloaded and select it. The toolkit will walk you through the rest of the process.
Wugfresh toolkit
Stock image