Abstract: A reprogrammable system arranged in a motor vehicle includes a data network that connects a plurality of control-units arranged in the vehicle for controlling vehicle systems. At least a first control-unit of the control-units is provided with a reprogrammable memory for storing software, which directs the first control-unit in controlling a vehicle system that is connected to the first control-unit. At least a second control-unit of the control-units is connected to a media-receiver adapted to receive a portable media, which includes software to be installed in the memory of the first control-unit. The second control-unit is further arranged to obtain the software from the portable media and to transfer the software to the first control-unit. A method for reprogramming an ECU by using the reprogrammable system arranged in a motor vehicle is also provided.