removing the ECU immobilizer feature car battery

Procedure for removing THE BATTERY, auto with ECU immobilizer feature
(For example in THE PEUGEOT type 306 N5, 406-1998-onward D8, D9 406, etc.)
1. Open the car windows and then close the car door with a meeting;
2. Turn the ignition to the Off position, then turn it back to the On position (the engine should not be live or on-start);
3. Wait at least 10 seconds in the On position is;
4. Then,