You're looking for a guide on fixing Covadis 17.1H!
The "171h" error is usually a temporary roadblock, not a permanent failure, often resolved by updating the USB driver. If you'd like, I can: covadis 171h fix
Hardware Key Detection: Error code 3 (SP_UNIT_NOT_FOUND) indicates the hardware key is missing or not properly attached. Verify the connection and ensure the Sentinel driver is up to date. You're looking for a guide on fixing Covadis 17
Path Environment: Ensure the COVADIS installation folder is added to the "Trusted Locations" in AutoCAD Options. not a permanent failure