If you downloaded an auto-installer, such as the SPD_Driver_R4.20.4201 package from Hovatek:

Without the correct driver, your Windows PC will display a yellow exclamation mark in Device Manager, rendering your servicing tools useless. This comprehensive guide provides everything you need to safely download, install, and troubleshoot the SPRD U2S Diag COM drivers. What is the SPRD U2S Diag Driver?

Connect your Spreadtrum phone to the PC using a high-quality USB cable while holding the volume keys (Boot keys). Press Windows Key + X and select .

When a phone enters diagnostic mode, Windows assigns it a virtual serial communications port, frequently showing up as or another assigned COM port number. Key Use Cases IMEI Repair : Restoring lost or corrupted IMEI numbers.

If you need help resolving a specific error, please let me know your , the phone model you are trying to connect, and the flashing or repair tool you intend to use. Share public link