Method for booting up software in the boot sector of a programmable read-only memory

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 programmab1e control device.