Hold the while clicking Restart in your Windows Start Menu.
The official source for the most stable Level X drivers. Summary of Essential Driver Files Driver Needed: Actia Basic+ XS / CAT Level X Driver.
, including "Level X" drivers for Windows 10 and 11 (x86/amd64). Third-Party Packs
: The 9780.Z5 is the reference number for the Lexia 3 interface. Ensure your unit is properly powered via the vehicle's OBD port, as some drivers will not initialize correctly on USB power alone. Troubleshooting
virtual machine for maximum compatibility with older interfaces. Driver Installation Locate the "Setup Drivers DiagBox" "PSA VCI Driver" executable within your installation media. Run the installer (often named PSA_VCI_Driver.exe or found in a folder) as an Administrator
Here is a guide to finding and installing the correct drivers for your interface. 1. Where to Find the Driver
If the device drops connection the moment Diagbox opens, the software is attempting to automatically flash the firmware, causing the driver to cycle. To fix this, change the MAJ_COM=TRUE string to MAJ_COM=FALSE in your appdiag.ini file to block automatic firmware updates. Operating System Compatibility Tips
However, getting the system to recognize this interface can be a major hurdle. Driver communication failures are the most common reason DIY mechanics and professional technicians struggle with PSA diagnostics.
Disconnect the USB cable from the computer.
Connect the other end to the car's OBD2 port to power the unit. Step 3: Install via Device Manager
You should see one of the following entries without any yellow warning triangles: USB Com Board Driver (Multi-instance) ACTIA USB Com Board Driver Troubleshooting "Device Not Recognized" Errors
Upon reboot, press or F7 to select Disable driver signature enforcement . Reinstall the Actia driver via Device Manager. Fix 3: Firmware Flashing (PSA Interface Checker)
: Plug the VCI into your USB port. If it shows as an "Unknown Device" in Device Manager