Patent ID: 7584350

Claim:
Method of booting up an update software in a writable memory area of a boot sector of a programmable control device of a vehicle, comprising the steps of: providing a boot-up software that can be booted up in a writable memory area located outside the boot sector of the programmable control device, wherein the boot-up software can install the update software in the writable memory area of the boot sector; booting up the boot-up software and the update software in the writable memory area situated outside the boot sector; executing the boot-up software in the programmable control device in order to install the update software in the writable memory area of the boot sector; and applying a signature process to at least a portion of the boot-up software or to the update software, wherein the at least a portion of the boot-up software or update software is signed before its transmission into the programmable control device by a first signature key and, after its transmission into the programmable control device is checked with respect to its integrity by means of a second signature key filed in the programmab 1 e control device.