https://devzone.nordicsemi.com/f/nordic-q-a/102976/ble_dfu_peripheral_lbs-west-build-failedI follow procedures listed on . But west build failed with a lot of undefined symbols. D:\ncs\v2.4.0\nrf\samples\bluetooth\ble_dfu_peripheral_lbs&gt;west build -b nrf5340dk_nrf5340_cpuapp -- west build: generating a build system Loading Zephyr defaulten-USTelligent Community 13Fri, 18 Aug 2023 11:12:22 GMThttps://devzone.nordicsemi.com/thread/442061?ContentTypeID=1Fri, 18 Aug 2023 11:12:22 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1a9beead-7767-4ac7-a19c-87bc0b06b898Marte Myrvold<p>Hi,</p> <p>The names of MCUmgr Kconfig options have been standardized. See Sigurd&#39;s response in &nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/101393/dfu-with-nrf-connect-2-4/434120">RE: DFU with nrf connect 2.4</a> .</p> <p>Please also note that the tutorial is based on nRF Connect SDK v1.8.0, and might therefore be outdated. I recommend taking a look at <a href="https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.4.1/nrf/working_with_nrf/nrf52/developing.html#fota-over-bluetooth-low-energy">FOTA over Bluetooth Low Energy</a> in our documentation instead.</p> <p>Best regards,<br />Marte</p><div style="clear:both;"></div>