“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 communication with the vehicle 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 wait several minutes before checking again. (The security certificate download is not displayed on the screen.)

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

3) If the issue persists after following the steps above, contact the Customer Service team.