If your hardware is a no-name Chinese PCIe serial card, the 60806A code might be counterfeit. For $15-20, purchase a or Syba card that explicitly states "Windows 10/11 native driver support" on the box. These come with a CD or a direct download link.

This is the correct driver for 99% of cases.

If you followed every step and still have issues, consider hardware failure. Serial port controller chips can physically burn out. However, in 95% of cases, the steps above resolve the completely.

[Insert direct download link]