To resolve this, users frequently have to perform a "driver roll-back," manually installing an older, legacy version of the driver (typically version 3.2.0.0 from 2007) that does not perform the chip-authentication check. Once the correct driver is seated and the COM port is identified, the connection becomes stable. Why It Matters
Click "Install" in the driver window. Windows may show a security warning; click "Install this driver software anyway." You should see a confirmation: "Driver installed successfully."
offer proprietary cables and software that handle the driver installation for you. Step-by-Step Installation Guide WLN KD-C1 Programming & 75 Mile Repeater Test - Part 2
. This is the most common driver for Chinese-made programming cables. For Genuine Cables : If you purchased an RT Systems Programming Kit
Common in older or "counterfeit" cables, which often require specific legacy drivers to work on Windows 10/11. 2. Where to Download the WLN KD-C1 USB Driver