this is a summary of a post, for the full post and all download links read it http://www.samex4rill.com/2015/02/how-to-unroot-any-andriod-phone-using.html

Did you happen to root your phone and you're now looking for way to unroot it, even though I see no reason for you to want to unroot your phone unless your phone is faulty and you want your phone warranty back so you can return it to the manufacturer. The method I will be discussing here in my post is the use of an application called "Universal Unroot" which can unroot your phone in just one click. check the source of this post above to get the download link

I want you guys to know that this is a great app for those people who are trying to complete the warranty return with a carrier for detective device hardware or a repair.