Ensure the battery is at least 50% charged to prevent the phone from dying mid-process. USB Cable: Use a high-quality micro-USB data cable.
Most technicians use the SPD Upgrade Tool or Z3X Box (if you have the hardware). For a free software-only approach, the ResearchDownload or UpgradeDownload tool is standard. e1200m flash file install
Once the tool detects the phone, you will see a progress bar move across the screen indicating "Downloading." You can release the boot key once the process starts. Ensure the battery is at least 50% charged
Select the firmware file (it will have a .pac extension) and click "Open." Wait a moment for the tool to load the packet. Step 4: Configure Settings (Optional) e1200m flash file install
Specifically the Spreadtrum chipset drivers. Step-by-Step Installation Guide Step 1: Extract the Files