Connect your Spreadtrum phone to the PC using a high-quality USB cable. Ensure the phone is booted into (often activated via a service code dialer like *#*#83781#*#* or specific key combinations during power-on).
Select (or Spreadtrum Enterprise Digital Serial Port) from the list.
Browse to your extracted folder. Select the sprd_usb_serial.inf file from the x64 (64-bit) or x86 (32-bit) subfolder depending on your OS. sprd u25 diag driver work
Press or F7 to select "Disable driver signature enforcement." After rebooting, try to install the driver again. Troubleshooting: "SPRD U2S Diag Port Not Showing"
: Allowing engineering software to access the device's Non-Volatile (NV) RAM to write or restore identification numbers. Connect your Spreadtrum phone to the PC using
For phones, this is often done by dialing a special code (e.g., *#*#83781#*#* ) or by enabling in Developer Options.
Typically identified by the Vendor ID USB\VID_1782 and Product IDs such as PID_4D00 or PID_5D29 . Driver Functionality Browse to your extracted folder
Mastering the SPRD U25 Diag Driver: Setup, Troubleshooting, and Advanced Use
The SPRD U25 Diag driver is an essential tool for professional repair technicians and advanced enthusiasts. It provides the critical low-level access needed to unbrick devices, repair IMEI numbers, and bypass FRP locks on Spreadtrum/Unisoc-based hardware.
However, many users face issues where the driver fails to install correctly, showing a yellow exclamation mark or appearing as an "Unknown Device." This article explains what the is, how to get it to work, and how to troubleshoot common installation issues in 2026. What is the SPRD U2S Diag Driver?