How to Flash (.Pac firmware) on Android Smartphone
In which Smartphone file format as like as .PAC type. Those rom when used then you need a spreadtrum Upgrade Tool named Software.

Which software’s are necessary to Flash your Smartphone:

1. Smartphone Firmware
   
2. Spreadtrum UDB Driver
   
3. spreadtrum Upgrade Tool
   

Download and extract Spreadtrum Upgrade Tool on your computer and Click on  (Upgrade Download.exe) to open your spd flash tool Software
After launching Spreadtrum Upgrade tool Click on the sing to the following picture to load .PAC Firmware.


If the PAC Firmware successfully loaded then click on start button of SPD Upgrade tool and press Volume (-) button of your smart phone with connecting to your windows PC.

Your screen will show following picture when your flashing process completed .

After that when your flashing process finished a sign green pass will show like that.