A method to remotely flash an external module comprises the steps to electronically transfer a computer program from a computer device to an external module, to partially install the external module to a vehicle, to extract the key data from a device securing the vehicle, to transfer the key data to a computer, to analyze and process the key data with a computer program generating a new computer program allowing the external module to communicate with the security device, to transfer the generated computer program to the external module, to complete the installation of the external module to the vehicle.