Ttl232r-3v3 Driver | 2K — 1080p |

| Symptom | Likely Cause | Fix | |---------|--------------|-----| | No device appears | Driver not installed | Reinstall FTDI VCP driver | | Device appears but no data | TX/RX swapped | Swap orange & yellow | | Garbage characters | Baud rate mismatch | Match baud rates exactly | | Can't open port | Another app using it | Close all serial monitors | | Device disappears after a few seconds | Power draw from red wire too high | Use external power for target | | "FTDI FT232R USB UART" with warning in Device Manager | Fake FTDI chip (counterfeit) | Use older FTDI driver (v2.8.14) or buy genuine |