HOW TO FLASH ANDROID STOCK Rom WITH SP FLASH TOOL

Thing's needed:

• MT6577 USB VCOM Driver (W7/Vista/W8)  Must Installed   Download    
• USB data cable buy one
• SP Flash Tool Download

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.

Source: http://www.androidvillaz.net/