Corrective Action for Error Code 5021-10-7005 During a KDS 2.0 ECU Upgrade

Symptom:  Error code [5021-10-7005] occurs during an ECU upgrade.

Cause: This error occurs when the control unit does not respond to an ECU upgrade security command or when the specified response time is exceeded.

Corrective Action: 

1. Check whether any aftermarket equipment is installed in the vehicle.
2. Verify the diagnostic tool connection and confirm that sensor data from the target control unit is displayed correctly.
3. If the connection and sensor data are normal, retry the ECU upgrade.
4. If the same error occurs again, contact GIT to test the upgrade using a file with adjusted timing.