https://devzone.nordicsemi.com/f/nordic-q-a/66097/is-is-possible-to-perform-dfu-without-the-nrfutilHi Team, I would like to perform the DFU without using the nrfutil and OTA update. Is there any way to perform DFU without the nrfutil. Our requirement is - We have a scenario where we cannot use the nrf mobile applications and nrfutil, But ween-USTelligent Community 13Mon, 21 Sep 2020 13:24:47 GMThttps://devzone.nordicsemi.com/thread/270615?ContentTypeID=1Mon, 21 Sep 2020 13:24:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:70170501-8091-4421-ab8d-c74a0e42ba5aEdvin<p>Hello,</p> <p>In theory, yes. This is possible, but we don&#39;t have any implementation of this.&nbsp;</p> <p>I guess the most useful would be to look at the implementation of <a href="https://github.com/NordicSemiconductor/pc-nrfutil" rel="noopener noreferrer" target="_blank">nrfutil</a>. Alternatively, the source code for the DFU part of nRF Connect for Desktop is <a href="https://github.com/NordicSemiconductor/pc-ble-driver-js/blob/master/api/dfu/bleTransport.js" rel="noopener noreferrer" target="_blank">found here</a>. Apart from that, I guess the source code for nRF Connect for <a href="https://github.com/NordicSemiconductor/Android-nRF-Toolbox">Android</a> and <a href="https://github.com/NordicSemiconductor/iOS-nRF-Toolbox" rel="noopener noreferrer" target="_blank">iOS</a> can be used as pointers as well.</p> <p>You should also check out the message flow chart from <a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/lib_dfu_transport_ble.html?cp=7_1_3_5_2_2" rel="noopener noreferrer" target="_blank">Infocenter</a>.</p> <p></p> <p>Even though you don&#39;t want to use nrfutil to perform the DFU, you should still use nrfutil to generate the image, that you then transfer on your own.</p> <p></p> <p>BR,<br />Edvin</p><div style="clear:both;"></div>