Those are the instructions to flash Pac Stock rom on any android device using research download tool or spd upgrade tool.
Remember: Your Android device Battery Should be Charged more then 50% to perform the Full flashing process.
2. Download your Desired Stock Firmware (.PAC) for your Android smartphone.
4. Run The ResearchDownload.exe or UpgradeDownload.exe in SPD Tool on your computer
6. After Spreadtrum Upgrade Tool SPD is launched, Adding the.Pac Firmware in Spreadtrum SPD Upgrade
7.Click on the Start Downloading button.Power Off Phone , Remove Battery, Insert Battery Back
8. Then keep holding on Volume Up and Volume Down keys and Insert USB cable connect your Android device or Cell phone to the PC. Release the keys when Start the flashing procedure.
9. During the Installing, your smartphone will restart or reboot automatically. If flashing is completed, you will see the Green Passed Message in The SPD Tool Or Spreadtrum Upgrade Tool.
10. Congrats you have successfully installed firmware your Android Smartphone through SPD Spreadtrum Upgrade Tool.
for a few moments.
11. Android Need to wait a few minutes the phone is switched