https://devzone.nordicsemi.com/f/nordic-q-a/56289/can-the-nrf52840-usb-dongle-be-re-flashed-via-usbAs far as I understand, the nRF52840 USB dongle can be flashed via USB if there&#39;s a DFU capable bootloader installed (and it booted *into* that mode). Once I got the dongle I was able to successfully do so. However I&#39;m kinda lost with how to re-flashen-USTelligent Community 13Wed, 08 Jan 2020 07:40:20 GMThttps://devzone.nordicsemi.com/thread/228032?ContentTypeID=1Wed, 08 Jan 2020 07:40:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bc083d61-3b00-471c-85dd-0b6c4c4d7a2eSimonr<p>Hi</p> <p>Yes, this should be possible if you add the DFU Trigger Library to your application. It allows a connected USB host to remotely tell the app to reboot into the bootloader to allow it to be updated via DFU. Please see the <a href="https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v15.3.0%2Flib_dfu_trigger_usb.html&amp;cp=5_0_3_5_3">Infocenter page</a> for more information on this library.&nbsp;</p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>