If you are working with devices powered by Spreadtrum (now UNISOC) chipsets, having a "verified" driver is the difference between a successful firmware flash and a "device not recognized" error. The is widely considered the stable standard for connecting SPD-based smartphones and feature phones to a Windows PC.
Right-click on DPInst.exe (or AutoInstaller.exe ) and select Run as Administrator . Follow the Wizard: Click "Next" through the prompts. spd driver r420 download verified