How to Unroot your Android Rooted Smartphone.

• Backup your data: While unrooting, all the data will be wiped out. so make sure to backup all your important data either on your SD card or your PC.
• Charge your phone: Ensure that battery is charged to more than 50%.This method works for all android devices that were rooted without installing custom recover.

How to Unroot your Rooted Smartphone. 

• First, download and install SuperSU app from Play Store.
• Launch SuperSU app, go to Settings, and tap on ‘Full unroot’.

• It will confirm you just tap continue.
•  After successful, Unroot superuser will close automatically.
• Restart your Device. 
• uninstall SuperSU app. 
• successfully, your phone is unrooted.