Check your Device Manager. Your interface should appear under "Universal Serial Bus controllers" as ACTIA USB Devices . If it has a yellow exclamation mark, reinstall the drivers located in your Diagbox installation folder. 2. Failed Firmware Flash
In community threads on automotive diagnostics, references to a "440 link" or connection dropouts point to an interrupted data stream between the Windows operating system and the Actia USB driver architecture. psa interface checker 440 link
: If you experience communication issues (e.g., "ECU not responding"), the Checker helps determine if the issue is a missing hardware component in the interface or a software/driver conflict. Identifying Genuine vs. Clone Hardware Revision Status : High-quality "Full Chip" interfaces will show as Reference 921815C in the Checker. Older or lower-quality clones often show as Revision B Check your Device Manager