Flash Pac Stock Rom on Android Smartphone
Step 1: Download and Install Spreadtrum USB Driver on your Computer. If in case Spreadtrum Driver is already installed on your computer then SKIP this Step.
Step 2: Download Stock Rom (pac) for your Android Device.
Step 3: Download and extract Spreadtrum Upgrade Tool on your computer. After extracting, you will be able to see the following files.
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.
If you ever got Bin Packet Error then simply download and try flashing the firmware with this version of SPD Upgrade Tool
After flashing the stock firmware on Spreadtrum Device, you may need to flash the IMEI also, for that use WriteIMEI or Read&Write Tool to Flash IMEI on Spreadtrum Devices..