Unroot My Tablet apk file
https://download.apkfiles.com/download/491946/unroot-my-tablet.apk?138898

This app will unroot any Android tablet safely - Free

Simply tap on the 'Unroot' button and the app will take care of the rest. After the process is finished the tablet will be rebooted automatically. This process is PERMANENT - cannot be undone.
Know your tablet: This app displays some information about your tablet such as: Kernel, CPU, Brand, Model, Board, SDK version and hardware
Note: 
1- This app is for ROOTED tablets please make sure you have any superuser app installed as a system app in order to grant access.
2- Tested on MTK6575, MTK6582 Rooted Tablets.
compatible with all other tablets.