https://devzone.nordicsemi.com/f/nordic-q-a/122194/mcumgr-serialrecovery-too-slowHello DevZone, For some reason, some customers didn&#39;t want to add an external flash on their module. So I advice them to use MCUBoot SerialRecovry single bank DFU. I modified a Matter Lock project byreferring this( Exercise 1 - DFU over UART - Nordicen-USTelligent Community 13Thu, 12 Jun 2025 09:05:32 GMThttps://devzone.nordicsemi.com/thread/538976?ContentTypeID=1Thu, 12 Jun 2025 09:05:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:41cf677f-8676-4624-b5be-15d03afa1118Jayant Tang<p>By referring to <a href="https://devzone.nordicsemi.com/f/nordic-q-a/86191/mcuboot-slow-with-nrf52840-zephyr-usb-cdc_acm-protocol">this ticket</a>. I know that the slow DFU speed is caused by the MCUMgr software in Go language.</p> <p>Then I changed to the <a href="https://github.com/vouch-opensource/mcumgr-client/">mcumgr-client</a>&nbsp;which is written in Rust. It reduce the DFU time from 13min to 2min.</p> <p>The commands of mcumgr-client is different.</p> <p><pre class="ui-code" data-mode="powershell"> mcumgr-client -d COM3 list mcumgr-client -d COM3 -m 512 upload &quot;D:\Project\lock\build\lock\zephyr\zephyr.signed.bin&quot; mcumgr-client -d COM3 reset</pre></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/538953?ContentTypeID=1Thu, 12 Jun 2025 06:54:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:980c8d7f-8935-423d-9821-229580fbd300Jayant Tang<p>By the way, what does <a href="https://docs.nordicsemi.com/bundle/ncs-3.0.2/page/nrf/app_dev/device_guides/nrf54l/features.html#mcuboot_bootloader_support">this</a> meaning?<br /> <div style="padding: 1em; margin: 1em 0; color: #444; background-color: #fff; border: solid 1px #ddd;"> The second-stage bootloader functionality and the serial recovery mode are currently not supported. </div> </p> <p>I can DFU over mcuboot serial recovery. But why the document says 54L15 doesn&#39;t support single bank DFU?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/538799?ContentTypeID=1Wed, 11 Jun 2025 11:15:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d7271928-34f4-4cba-964d-f0abe88d9cf1Jayant Tang<p>My project:</p> <p><a href="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/7215.lock.zip">devzone.nordicsemi.com/.../7215.lock.zip</a></p> <p>DFU commands:</p> <p><pre class="ui-code" data-mode="powershell">mcumgr conn add testDK type=&quot;serial&quot; connstring=&quot;COM3,baud=115200,mtu=512&quot; mcumgr -c testDK image list mcumgr -c testDK image upload D:\Project\lock\build\lock\zephyr\zephyr.signed.bin mcumgr -c testDK reset</pre></p><div style="clear:both;"></div>