Reinstall the SPD drivers and try a different USB port.
Download the SPD Upgrade Tool (also known as ResearchDownload or FactoryDownload), which is the official utility for Spreadtrum/Unisoc chipsets.
Before starting, ensure you have the correct version of the firmware. Flashing the wrong file can result in a "hard brick" (a device that won't turn on at all). Symphony i95 Network Support: 4G (Bands B1, B3, B8) Chipset: Spreadtrum (SPD) File Type: Scatter/PAC file Tool Required: SPD Upgrade Tool or Research Download Tool 🛠️ Preparation Checklist
Moving between different Android versions for better stability. Technical Specifications
To help troubleshoot or provide the most accurate advice, please let me know: