| Problem | Likely cause | Solution | |---------|--------------|----------| | Device not recognized | Driver missing or generic driver installed | Uninstall generic USB serial driver; install correct chip driver | | Yellow exclamation mark (Windows) | Fake chip (especially PL2303) or driver conflict | Use older driver version or switch to FTDI‑based cable | | Works on Linux but not Windows | Wrong driver version | Uninstall all USB serial drivers, reboot, install official FTDI driver | | Cable detected but no console output | Wrong COM port number, baud rate, or device not in console mode | Check terminal settings (9600 8N1 typical), verify cable is connected to console port not Ethernet |