The stock camera broke
I followed the steps and everything went smooth
be gentle when pulling the metal frame and dont forget to disconnect the cables first
My Nexus 6 from Google's Project Fi had a piece of dust or hair within the rear facing camera. It didn't show up until shortly after a month of having it and it drove me crazy... It showed up in every picture... Taunting me, antagonizing me with every click that should have been a fond memory. Unfor . . .