Unroot MediaTek Device apk file
https://download.apkfiles.com/download/468193/unroot-mediatek-device.apk?109601

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

IMPORTANT: Problems might occur if the device is not properly rooted, please take a backup before unrooting your device.