You cannot install drivers blindly. You must first identify which USB-to-Serial chipset your Actia interface uses.
Before installing drivers, ensure your PC meets the minimum requirements to run the diagnostic software smoothly: actia psa xs evolution drivers
Even with correct drivers, problems arise. Here is a troubleshooting matrix: You cannot install drivers blindly
| Symptom | Likely Cause | Solution |
| :--- | :--- | :--- |
| "No VCI Found" in DiagBox | Wrong COM port | Force COM1 in Device Manager > Advanced. |
| Driver installs but has a yellow triangle | Counterfeit FTDI chip | Roll back to FTDI v2.8.30 or use zadig to install WinUSB driver. |
| Car communication drops mid-diagnosis | USB latency too high | Set Latency Timer to 1 ms as shown above. |
| Windows 11 refuses to load driver | Driver signature enforcement | Boot with signature enforcement off or use signed FTDI drivers v2.12.28+. |
| Actia shows as "FTDIBUS" device | Corrupt driver cache | Run pnputil /delete-driver then reinstall. | Even with correct drivers, problems arise