https://devzone.nordicsemi.com/f/nordic-q-a/34608/raise-nordicsemiexception-failed-to-send-firmwarewhen i load my new application by dfu serical it shows , and my commonitor show that my make zip command have anyone know solved this problemen-USTelligent Community 13Wed, 23 May 2018 11:41:00 GMThttps://devzone.nordicsemi.com/thread/132969?ContentTypeID=1Wed, 23 May 2018 11:41:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:06f2a28c-5a4c-4282-9cbd-7c3207a0edf3Bj&#248;rn Kvaale<p>Which sdk version of the dfu serial example are you using? Does it make a difference if you use COM5 instead of com5 in your nrfutil command? Which version of nrfutil are you using?</p><div style="clear:both;"></div>