Those are the instructions to flash Pac Stock firmware/rom on any android device using UpgradeDownload Tool.
Remember: Your Android device should have at least 35-50 % of battery to perform the Full flashing process.
Instruction flash Pac Stock Rom Using UpgradeDownload Tool:
Step 2: Download desire Stock Rom (pac) to your computer.
Step 3: Download & extract Spreadtrum Upgrade Tool on your computer. After Extract you will be able to see the following file:
Step 4: Now, open UpgradeDownload.exe file.
Step 5: Once Spreadtrum UpgradeTool is Opened , connect your Android smartphone to the computer (make sure that your device is switch off).
Step 6: when your Smartphone is connected successfully to the computer, click on the Button and add the .pac file (stock rom which shown as .pac).
Step 7: Once you have successfully added the Pac flash file in Spreadtrum Upgrade Tool , click on the Start Downloading button to begin the flash process.
Step 8: Once flashing process is completed, you will be able to see the Green Passed Note in Spreadtrum Upgrade Tool.
Finally : Now successfully flashed your Android Device using Spreadtrum Upgrade Tool.