Rooted nexus 6 will not boot up after I edited build prop

Hey all this is my first post on XDA.

So I was trying to unroot and relock my nexus 6 so i decided to replace the build.prop that i have edited with a copy of the original build.prop i had saved on my phone. I used root browser to do this. after I did this I restarted my phone and all I would get is a black screen with google in white and an unlocked lock. it will not boot back up.

My phone will go into recovery mode and that about all i can tell you.

I would truly appreciate your help.