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Save this guide, download the drivers in advance, and never fear the Spreadtrum SCI driver again.
Powering hundreds of millions of low-cost mobile devices globally.
| Problem | Solution | | :--- | :--- | | | Re-install driver with signature enforcement disabled. Use older driver version. | | Code 28 (Driver not installed) | Manually select driver from "Have Disk" list. | | Device appears and disappears quickly | Dead battery or short circuit in USB cable. Charge battery externally or replace cable. | | Device shows as "Unknown USB Device" | Your phone is not in Download Mode. Try button combinations or test point. | | Driver installs but no COM port | Install CDC Serial driver first. Some Unisoc chips need msc-debug driver. |
Upon reboot, press or F7 to select Disable driver signature enforcement . Step 2: Install via Device Manager spreadtrum sci usb2serial ok
When you connect a device powered by a Spreadtrum (now Unisoc) chipset to a computer, the hardware communication happens over a virtual COM port.
Spreadtrum chipsets only trigger the COM port interface for a few seconds when they first receive power. To lock in the connection:
You need the official Spreadtrum USB Driver package. Reliable sources include Driver Fusion or specialized GSM forums. Save this guide, download the drivers in advance,
Once the driver is installed, you must test if it works correctly with the device.
Hold down the key while clicking Restart in your Windows Start Menu.
import struct, zlib
sudo modprobe usbmon sudo wireshark -i usbmon2
Right-click the "Unknown Device" or "Spreadtrum Phone" entry.
If your device is listed with a yellow triangle or as an "Unknown Device," you need to install the drivers manually to reach the "OK" status. 1. Pre-Installation: Disable Driver Signature Enforcement Use older driver version
