Step 1.Download and install Android USB Driver on your Computer in case Android USB Drivers already installed your Computer then Skip The Step.
Step 2.Power off your Android SmartPhone and remove the battery (it is removable)
Step 3.Download the stock Rom or custom Rom that you want to Flash on your Android SmartPhone and Extract it on your computer.
Step 4.Download and Extract Smart phone Flash Tool on you Computer After Extracting you will be able to see following files.
Step 5.New open Flash_tool_exe
Step 6.Once Smart phone Flash tool is launched,Click on the Download Tab.
Step 7.In the download Tab,now click on the scatter -loading buttom.
Step 8.Now locate scatter file (you will find the scatter file in the Stock Rom folder)
Step 9.Now,Click on the download buttom to begin the flashing process.
Step 10.Now,Connect your Smartphone on the Computer using USB Cable (without battery-if it is removable).After connecting the device to the Computer Press Volume down or Volume Up key so that your Computer easily detect your Smartphone.
Step 11.Once flashing is completed.a Green Ring will appear.
Step 12.Close the smart phone Flash Tool on your Computer and disconnect your Android Smartphone from the Computer.