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An additional Makefile parameter NRFUTIL_PORT can be set in order to define the serial port to used for the DFU (Default: /dev/ttyACM0). The "nrfutil" that is used as flasher towards OpenBootloader is available for installation through Python "pip". In case of SD=s140, SoftDevice ID 0xB6 is passed to nrfutil's package generation which corresponds to SoftDevice s140 v6.1.1.