Please watch: "How Anyone Can Hack Wifi Password Without Root In Android Without Your Permission [Ethical Hacking]"
https://www.youtube.com/watch?v=ZGVd-CCu0YE
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watch the video carefully and create official scatter file for any MTK android phone and you can use it to flash ROMor firmware with sp flash tool.
SP flash tool can work if you have original scatter file of your phone and after then you can unbrick your dead phone in future .
Mtk Droid Tool - https://drive.google.com/open?id=0B8