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A method of upgrading a program, used in a data processing device having a permanent memory, from a version n to a version n+ 1, wherein, at any time, both the recent version and the previous version of the program are stored in a first and a second location of the memory. Each one of version n and version n+ 1 of the program is using configuration data of format n and format n+ 1, respectively, when it is used as a current version. The configuration data of format n are automatically stored into the memory when version n+ 1 of the program is stored into the second location of memory.