1. A method for updating settings of selected processors comprised of a multiprocessor system in cooperation with a support hardware comprising one or more support processor, which enables the insertion of scan chain data to one or more processors, the method comprising the steps of: a) during normal operation of said multiprocessor system updating a preselected spare processor with new scan chain data by inserting said data via said support hardware; b) moving workload from an active processor, the setting of which is to be updated, to said updated spare processor in order to make the former active processor a new spare processor; c) updating a respective scan chain data for said new spare processor; and d) moving the workload from an active processor to said new spare processor and continue until all of said selected processors have been updated with new scan chain data.