Windows blocked the driver because it lacks a valid digital signature. Solution: You must restart your PC and disable driver signature enforcement as described in Step 2 above. For Windows 10 and 11, this is the only reliable fix.
Connect your device while holding the "Boot Key" (usually Volume Down or Up).
Watch the list refresh. Look for or SPRD U2S under Ports (COM & LPT) or Other Devices . Right-click the device and select Update driver . spreadtrum sci usb2serial ok
: Essential for manual driver installation when a computer fails to automatically recognize a Spreadtrum device in download mode.
: The software is now ready to perform operations such as flashing firmware, unlocking FRP (Factory Reset Protection), or repairing IMEI. Technical Specifications Driver Name SCI USB2Serial / Spreadtrum COM Port Hardware ID USB\VID_1782&PID_4D00 sciu2s.inf Supported OS Windows XP, 7, 8, 10, and 11 (32/64-bit) How to Achieve this Status Windows blocked the driver because it lacks a
: The PC has successfully "handshaked" with the phone’s bootloader, usually while the phone is in Download Mode Ready for Action
Open your preferred service application (such as ResearchDownload, UpgradeDownload, or NCK Box). Choose your packet firmwares (.pac), select the newly assigned COM port speed, and press the Start button. The tool should now bypass the previous loop and initiate the data transfer seamlessly. Connect your device while holding the "Boot Key"
For developers and advanced users, the SCI USB2Serial driver opens the door to powerful command-line tools. Projects like allow you to interact with a Spreadtrum device's BootROM, executing commands such as:
For a standard user, this driver is invisible. However, for developers and repair technicians, it is an indispensable tool for several key tasks.