If you want, tell me the phone model and I’ll provide more specific steps (diag key combo, recommended driver package name, and which flashing tool to use).
Cause: Windows installed its own generic serial driver.
Solution: Manually update driver as per Method 2. Force reinstall with Have Disk option.
Who should use it?
Who should avoid?
Rating: 2.5/5
Essential functionality let down by zero signing effort from Unisoc and fragile Win10 x64 behavior. Works reliably only after jumping through security hoops. For professional use, consider a dedicated Windows 7 VM with USB passthrough instead. Sprd U2s Diag Driver For Windows 10 64 Bit
As of 2025, Unisoc (formerly Spreadtrum) has improved its driver signing. Newer chips (Unisoc Tiger T606, T618, etc.) use CDC Diag class drivers that are WHQL-signed. If you have a newer device, look for "Unisoc USB Diag Port" rather than "SPRD U2S." The legacy SPRD U2S name is still used for older chips like SC7731, SC9832, SC9850, and SC9863.
If you are working with a modern Unisoc phone (2022–present) and Windows 10 64-bit, try official Unisoc CDC drivers – they require no signature bypass. If you want, tell me the phone model
| Feature | Specification |
| :--- | :--- |
| Developer | Spreadtrum Communications / Unisoc |
| Supported OS | Windows 10 (x64), also compatible with Win 7/8/11 (x64) |
| Driver Type | USB Device Driver (Virtual COM Port) |
| Hardware ID Examples | USB\VID_1782&PID_4D00 (Spreadtrum Generic) |
| Installation Format | Usually provided as an executable (.exe) or a manual folder for "Have Disk" installation. |
| Use Case | Mobile Software Repair, Network Calibration, Firmware Downgrades. |