Sometimes, Windows refuses to install the driver because it is not signed. Go to Settings > Update & Security > Recovery. Under , click Restart now .
Change the COM port number to a lower number (e.g., COM3, COM4).
What is the shown in Device Manager (e.g., Code 10, Code 52)? What operating system are you using (Windows 10/11)? Are you using a phone or an IoT module ? sprd u25 diag driver work
The driver allows a Windows computer to communicate with the Spreadtrum chip inside a device while it is in diagnostic mode. It is primarily used for:
If this guide helped you, consider contributing to the open-source SPRD diag tooling project. For persistent issues, capture a USB trace via Wireshark with the usbmon module and consult the developer forum. Sometimes, Windows refuses to install the driver because
If you have followed the installation steps and the driver still refuses to work, apply these diagnostic workarounds: Force Manual Update via Device Manager
The Diag mode is critical for several advanced procedures: Change the COM port number to a lower number (e
If you are trying to flash a Spreadtrum/UNISOC device, read QCN/NV data, or repair IMEI, you have likely run into the dreaded "Diag Port" issue. The device shows up as or just "Spreadtrum USB Device" in Device Manager, but your flashing tool (SPD Research Tool, Miracle Box, etc.) won't recognize it.