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**SPD Flashing Tutorial (Unisoc/Spreadtrum SoC phones)**
1. **Download Tools & Files**
* SPD/Unisoc USB Drivers → install on PC.
* ResearchDownload / UpgradeDownload tool.
* Correct firmware (PAC file) for your phone.
2. **Setup**
* Extract firmware and flash tool.
* Open *ResearchDownload.exe*.
* Load the PAC file (click gear icon → select PAC).
3. **Flash Process**
* Power off phone.
* Hold *Volume Down* (or Vol Up, depends on model).
* Connect USB cable.
* Click “Start Downloading” in the tool.
4. **Wait**
* Flashing will begin (green progress bar).
* When you see “Passed”, disconnect phone and reboot.
**Note:** Always use correct firmware, wrong file can brick your device.
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