Error Code Occurs During ECU Upgrade (5021-10-7F22)

Symptom:

Error code [5021-10-7F22] or [7000-27-7FF0] occurs during an ECU upgrade.

Cause:

These error codes indicate that the required conditions for the control unit's communication open command have not been met.

Resolution:

1. Check the vehicle status: Confirm that the ignition is ON when performing the software update. If the ignition is OFF, turn it ON and try again.
2. Check the upgrade mode: Determine whether the ECU upgrade was attempted in Automatic Mode or Manual Mode.
3. Verify Manual Mode settings: If the upgrade was performed in Manual Mode, confirm that the ECU upgrade was attempted using the correct subcategory for the control unit.
4. Check for aftermarket equipment: Check whether any aftermarket equipment is installed in the vehicle. This equipment may interfere with the upgrade process.
5. Obtain additional support: If the issue persists, contact the control unit manufacturer or the automotive research center for further assistance.

Additional Information:

• Check the control unit version: Confirm that the control unit version can still be read correctly, and provide the vehicle status information to the Customer Support Center.