“User Authentication Failed. (Code:4001)” Pop-up Appears When Logging In

Symptom: The following message appears when attempting to log in, perform an ECU Upgrade, or use additional functions.

Cause: This message may appear if the security certificate required for secure vehicle communication is missing from the diagnostic device or is not up to date. 

Solution:

1) When you log in again, the security certificate is downloaded in the background. Close KDS 2.0, restart the diagnostic device, log in, and then check again after several minutes. (The security certificate download is not displayed on the screen.)

2) If the same symptom persists after logging in again and the connected Wi-Fi network is a secured network, connect to an unrestricted network, such as a mobile hotspot, and then try logging in again.

3) If the issue persists after performing the steps above, contact the Customer Service Team.