MTK Android (Sp flash tool ) tutorial

What's needed:

• USB data cable
• MediaTek USB VCOM drivers - DOWNLOAD
• SP Flash Tool - DOWNLOAD

• First of all, make sure that you have MediaTek DA USB VCOM drivers installed.

Flashing the whole ROM

• First of all open SP Flash Tool, then click Scatter-loading button to load the correct scatter file
  (MT6575_Android_scatter_emmc.txt or MT6577_Android_scatter_emmc.txt, depending on which phone you have) for your device and ignore any message that may appear.

• Turn off your phone, remove the battery and replace it after some seconds (and don't turn on the phone).
• Press F9 (or hit Download button) and connect your phone into the computer via USB data cable.
  The process will start and a red progress bar will appear.

• After the red progress bar is complete, there will appear a purple progress bar.

• Right after the purple progress bar is complete, a message will appear underneath it:
  “Please insert USB cable in x seconds” and then the download will start right away (you will see the yellow progress bar filling up).

• When the yellow bar is complete, you'll get a popup with a green circle and Download OK message,
  which means that the process has been successfully terminated.

• You can now safely disconnect your phone and turn it on. The process ends here.

CREDIT: XDA