In this video, we see that the "master key" mentioned in the title is not a physical key, but an emergency procedure provided by Piaggio to start the scooter when the immobiliser code is not recognised, or the immobiliser light is flashing on the dashboard and the engine does not start. This procedure temporarily teaches how to recognise a new key in case of emergency. It is essential to have an original key already programmed and the emergency code found on the red keyring provided at the time of purchase with the scooter. Insert the original key into the ignition and turn it to "ON", and using the onboard computer, navigate to "diagnosis", where you will be prompted to enter the famous 4-digit code using the menu buttons. If the access is correct, the light with the padlock will start to flash differently, indicating that you are in programming mode. Turn off the ignition and remove the key, then insert the blank key. Wait a moment and listen for a "beep" of confirmation: the immobiliser light will turn off. Turn off the ignition and remove the key, then reinsert the new key and turn on the ignition. The immobiliser light should illuminate and turn off after a couple of seconds, just like the original key does. If the scooter starts normally, the procedure has been successful.