The software component that maps this physical USB connection to a virtual COM port is the . Once installed, Windows registers the device as SCI Android USB2Serial under the Ports (COM & LPT) section of your Device Manager. The phrase "Spreadtrum SCI USB2Serial OK" is a standard confirmation message outputted by flashing tools like SPD Upgrade Tool , ResearchDownload , or premium dongles (like Miracle Box or Go to product viewer dialog for this item.
The is a specialized communication interface produced by Spreadtrum . It functions as a bridge that allows a Windows PC to treat a connected smartphone or tablet as a standard COM (serial) port. This connection is critical for performing advanced maintenance tasks such as:
: Service tools such as NCK Box utilize this driver to perform network unlocks or FRP (Factory Reset Protection) resets.
Click on your computer’s name at the very top of the device list tree.
Comprehensive Guide to Fixing the "Spreadtrum SCI USB2Serial OK" Driver Issue
The phone is booting into Diagnostic mode instead of Flash/Download mode.
Use a USB 2.0 port (black plastic inside) instead of a USB 3.0 port (blue plastic). USB 3.0 controllers often drop older Spreadtrum bootloader connections.
drivers have been successfully installed and the device is properly communicating with the computer through a virtual
When troubleshooting mobile devices using software utilities like the , ResearchDownload , Infinity-Box , or Miracle Box , establishing a connection is the most error-prone phase.
Troubleshooting Your Spreadtrum Connection: A Guide to the SCI USB2Serial Driver