https://devzone.nordicsemi.com/f/nordic-q-a/94768/ncs-v2-2-0-sample-peripheral_lbs-dfu-over-uart-fail-nrf5340Hi, follow the to do DFU over UART on nRF5340, it fail in the last step &quot;image confirm&quot;. The console show What is the meaning &quot;Error: 3&quot;? How to fix it? Can I find the meaning in https://github.com/apache/mynewt-mcumgr ?en-USTelligent Community 13Mon, 12 Dec 2022 10:08:19 GMThttps://devzone.nordicsemi.com/thread/400089?ContentTypeID=1Mon, 12 Dec 2022 10:08:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:407cf043-f9c0-4c85-8917-2a94fa0d1a99Sigurd Hellesvik<p>Hi,</p> <p>See <a href="https://github.com/apache/mynewt-mcumgr/blob/62009e0ef131762f966e2f877bc467fb5743d35b/mgmt/include/mgmt/mgmt.h">https://github.com/apache/mynewt-mcumgr/blob/62009e0ef131762f966e2f877bc467fb5743d35b/mgmt/include/mgmt/mgmt.h</a></p> <p>You are missing a hash value for the &quot;image confirm&quot; command.<br />Try &quot;mcumgr image confirm --help&quot; to see the command syntax.</p> <p>Regards,<br />Sigurd Hellesvik</p><div style="clear:both;"></div>