Symptom: During an ECU upgrade, error code [5021-31-7F33] occurs.
Cause: The ECU returned a negative response to the erase memory or checkdependency command during the ECU upgrade.
Resolution:
1. Check whether the ECU upgrade was performed in Automatic Mode or Manual Mode.
2. If it was performed in Manual Mode, verify that the ECU upgrade was attempted using the correct subcategory for the ECU.
3. Check whether any aftermarket equipment is installed in the vehicle.
4. Check whether any work has been performed on the gateway installed in the vehicle.
5. If the issue persists, contact the ECU manufacturer or the vehicle R&D center.
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