These are the instructions to flash Pac Stock ROM on devices running on Spreadtrum Chipset using the SPD Upgrade Tool or SPD Research Tool.
Remember: Your Android device should have at least 40-50 percent of battery to perform the flashing process.
Step 2: Download Stock Rom (pac) for your Android Device.
Step 4: Now, open UpgradeDownload.exe.
Step 5: Once Spreadtrum Upgrade Tool is launched, connect your Android device to the computer (make sure your device is switch off).
Step 6: Once your Smartphone is connected successfully to the computer, click on the Load Packed Button and add the .pac file (stock rom which comes as .pac).
Step 7: Once you have successfully added the Pac file in Spreadtrum Upgrade Tool, click on the Start Downloading button to begin the flashing.
Step 8: During the flashing process your device will restart automatically. Once flashing is completed, you will be able to see the Green Passed Message in Spreadtrum Upgrade Tool.
Step 9: Now you have successfully flashed your Android Device using Spreadtrum Upgrade Tool. Once your Android Device is successfully restarted, Go to Settings > About Phone > Check firmware.
[*] Bin Packet load Error: If you ever got Bin Packet Error then simply download and try flashing the firmware with this version of SPD Upgrade Tool.
[*] Credits: SPD upgrade tool shared on this page is made available by Spreadtrum Communications Inc. So, full credits goes to them for the tool.