Error code occurred during ECU upgrade (5021-10-7F22)

Symptom: ECU upgrade in progress, error code [5021-10-7F22] occurs

Cause: It occurs when the controller responds negatively to the ECU upgrade communication open command.

Resolution:

1. It is necessary to check which function of the automatic mode/manual mode was used to upgrade the ECU.
2. If it was performed in manual mode, it is necessary to check whether the ECU upgrade was attempted in a small category suitable for the controller.
3. It is necessary to check whether the car is equipped with aftermarket equipment.
4. If it still does not solve the problem, it is necessary to contact the controller manufacturer or automobile research institute.