Download and Install Spreadtrum USB Driver on your Computer. If in case Spreadtrum Driver is already installed on your computer then SKIP this Step.
Download .pac firmware for your device (Itel, other)
Download and extract Spreadtrum Upgrade Tool on your computer. Now, open UpgradeDownload.exe.Once Spreadtrum Upgrade Tool is launched, connect your Android device to the computer (make sure your device is switch off).
If Smartphone is properly connected to the computer, click on the Load Packed Button and add the .pac file (stock rom which comes as .pac).
Having successfully added the .Pac file in Spreadtrum Upgrade Tool, click on the Start Downloading button to begin the flashing.
During the flashing process your device will restart automatically.
Once flashing is completed, you will be able to see the Green Passed Message in Spreadtrum Upgrade Tool.
Now you have successfully flashed your Android Device using Spreadtrum Upgrade Tool.
After device is booted up successfully, Go to Settings > About Phone > Check firmware. Done! How To Flash a MTK based Phone or Tablet