How to fix a totally Dead / Brick MTK phone

Note: This procedure is the same for all MTK Android phones (e.g Tecno, Gionee, Infinix, Opsson, Innjoo, TLC, Lead1 etc) but the backup files to be used differ 

If you accidentally bricked your MTK phone through whatever means then follow below

Some people; however, attempt unbricking / fixing their bricked MTK phones using either the wrong procedure or OS files. As a result, their devices get worse. The phones enter into a higher level of unbricking whereby, they don't even boot or charge any more, just dead. Even pressing the power button would have no effect in such a scenario. What has happened is called a corrupted or missing Preloader (preloader.bin).
We wont go into details about the function of the Preloader but one function - which you must've figured out by now - is that it helps make your MTK phone boot. To fix the problem of a Corrupted / missing Preloader, you'll need the following:

How to fix a totally Dead / Brick MTK phone

Tools needed

Download SP Flash Tool
PC
USB Cord
If you have access to a working phone of the same model then follow this guide to make an MTK backup which should contain Preloader.bin and all other files you'll need
If you don't have access to a working phone of the same model then download an MTK backup for your phone model from below links

Tecno Stock ROMs
Gionee Stock ROMs

Procedure

 Using SP Flash Tool, flash the preloader.bin first See Guide here
 If flashing was successful then your phone should at least be able to vibrate when you press the power button or boot if the correct files are present on your phone; else, flash other necessary files to make the phone boot up and start working normally again