"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 diagnostic device does not have the security certificate required for secure vehicle communication, or if the certificate is not up to date. 

Resolution:

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 occurs after logging in again, the connected Wi-Fi network may be restricted. Connect to an unrestricted network, such as a mobile hotspot, and then try logging in again.

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