If it appears, open your flashing tool. It will auto-detect the COM port and start the process.
Once the driver is installed, you must test if it works correctly with the device. spreadtrum sci usb2serial ok
The Spreadtrum SCI USB2Serial (SCI = Serial Communication Interface) is not a standard UART-to-USB bridge like FTDI or CP2102. Instead, it is a proprietary diagnostic and engineering interface embedded within Spreadtrum/Unisoc mobile phone chipsets (SC77xx, SC98xx, UIS78xx, Tiger series). It appears as a USB CDC-ACM or vendor-class device, but implements a packetized protocol over bulk endpoints to access multiple logical channels (modem log, application log, GPS, secure debug, calibration). If it appears, open your flashing tool
Key insight: The "USB2Serial" name is a simplification. It's a multiplexed diagnostic bus over USB. The Spreadtrum SCI USB2Serial (SCI = Serial Communication
import struct, zlib
def decode_sci_frame(data): if len(data) < 12: return None magic, ch, flags, length, seq, crc = struct.unpack('<HBBHHI', data[:12]) if magic != 0xABCD: return None payload = data[12:12+length] calc_crc = zlib.crc32(data[:8] + data[12:12+length]) & 0xFFFFFFFF if calc_crc != crc: print("CRC mismatch") return "channel": ch, "seq": seq, "payload": payload