Follow these steps to check or upgrade your VCI interface safely. Prerequisites

Open the PSA Interface Checker.exe (usually found within the Diagbox installation directory).

Always use the short USB cable that came with your Lexia 3 device and plug it directly into a rear motherboard port (if using a desktop) or a USB 2.0 port (if using a laptop). Conclusion

Run through this 60-second protocol using PSA Interface Checker 4.4.0:

Original Actia interfaces, or high-quality "full-chip" clones, are identified as Revision C ( 921815C ). These work flawlessly with the latest Diagbox versions and newer vehicles.

I can provide specific firmware file recommendations based on your hardware. Share public link

$ psa-interface-checker --target https://mypsa.company.com --oauth-client-id svc_api --oauth-scope "read:projects write:time"