Flash Pac Stock ROM using SPD Upgrade Tool:
Step 1: Download and install Spreadtrum USB Driver on your computer. If you already have the SPD Driver installed, then you can skip this step.
Step 2: Download Pac Stock ROM/Firmware for your Android device.
Step 3: Download and extract the SPD Upgrade Tool (SPD Research Tool) on your computer. Once extracted, you will see the files, as shown in the image below.
Step 4: Launch the SPD Research Tool by double-clicking on “ResearchDownload.exe” file.
Step 5: Now power off your device and connect it to your computer.
Step 6: Once the device is successfully connected, click on “Load Packet” (gear icon) and add the .pac firmware file, which you have extracted in
Step 7: Once you have successfully added the Pac Stock ROM file to Spreadtrum Research Tool, click on the “Start downloading” button to begin the flashing process.
Step 8: During the flashing process, your device will automatically reboot several times. So don’t panic.
Step 9: Once the flashing process is completed, a Green Passed Message is displayed in the SPD Upgrade Tool.
Step 10: Now, the flashing process is completed. On your Android device go to Settings > About and check the firmware version.
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[Tutorial] How to use SPD Upgrade Tool
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