Method and system for updating a control unit of a motor vehicle

A method of updating on a control device (14, 16) of a motor vehicle (10) stored data, comprising the steps of: - transmitting data by means of which an operation of the control device (14, 16) is preset to a memory unit of the control device; - storing the data on the memory unit of the control unit (14, 16); - Check whether an error in the form of an erroneous data transmission and / or storage has occurred; characterized, in that if such an error wherein before the data transfer is made is determined, an at least in dependence on the type of the control unit (14, 16) according to predetermined vehicle mode is activated, a parameter file is read, in which at least one memory address of the control unit (14, 16 ) and parameters for a sequence control of the data transfer are stored, wherein the data transfer is then carried out according to the parameter file.