Step 1: Download Stock ROM Firmware zip file in your PC and extract it.
step 2:Download sp flashtool in your pc and extract it.
Step 3: Download USB Drivers install in PC. If already installed quit this step.
Step 4: Power Off / Switch of your smartphone (remove the battery for 10 second and put it back).
Step 5: Go to extracted folder “extracted in Step 2” > SP flash tool > you will see Flash-Tool.exe > Open this to Launch setup.
Step 6: One setup is launched Click on > Download Tab > Scatter Loading. Now locate scatter firmware file (Present firmware folder extracted in Step 1) and load it.
Step 6: Connect your device with PC via data cable (Keep in mind the device should be switch Off). Now click on Download Button / Upgrade Button (having sign of Green Arrow) to begin flash Flashing.
Step 7: Wait Until process complete. In end of Successful Flash Firmware, a Green dot / ring will appears.