https://devzone.nordicsemi.com/f/nordic-q-a/82999/device-firmware-updateHi all, I am trying to send dfu_application.zip from nrf toolbox to board(nrf52840) in zephyr but it shows fails, how can i send .zip file Thank youen-USTelligent Community 13Tue, 21 Dec 2021 13:51:50 GMThttps://devzone.nordicsemi.com/thread/344613?ContentTypeID=1Tue, 21 Dec 2021 13:51:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:2b33dea1-5580-47d7-ae42-00a8fa686803Simon<p>Try using the .bin file instead. More specifically, use the file &lt;sample&gt;/&lt;build folder&gt;/zephyr/app_update.bin.</p> <p>By the way, we have created an app dedicatd to mcumgr (which is the protocol you&#39;re using I assume), the <a href="https://www.nordicsemi.com/Products/Development-tools/nrf-connect-device-manager">nRF Connect Device Manager app</a>.</p> <p></p> <p>You may find this guide useful:&nbsp;<a href="https://devzone.nordicsemi.com/guides/nrf-connect-sdk-guides/b/software/posts/ncs-dfu">https://devzone.nordicsemi.com/guides/nrf-connect-sdk-guides/b/software/posts/ncs-dfu</a></p> <p>Best regards,</p> <p>Simon</p><div style="clear:both;"></div>