https://devzone.nordicsemi.com/f/nordic-q-a/36646/nrfutil-for-cygwinI am trying to perform a dfu upgrade according to: infocenter.nordicsemi.com/index.jsp The exact command I am running is: nrfutil dfu ble -ic NRF52 -pkg dev_board_bl.zip -p COM3 -a &quot;56:13:BD:9B:9C:3D&quot; where COM3 is where the connectivity (bridge) deviceen-USTelligent Community 13Thu, 26 Jul 2018 06:49:37 GMThttps://devzone.nordicsemi.com/thread/141454?ContentTypeID=1Thu, 26 Jul 2018 06:49:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6e26c3d4-a930-45a4-96c9-79aca1bffd99H&#229;kon Alseth<p>Hi Mikael,</p> <p>&nbsp;</p> <p>I had a talk with the developers, and cygwin is unfortunately not supported. The easiest workaround for now is to use for instance msys2 instead.</p> <p>This is reported internally as an issue.</p> <p>&nbsp;</p> <p>Kind regards,</p> <p>Håkon</p><div style="clear:both;"></div>