Application does not run after adding DFU (MCU BOOT)https://devzone.nordicsemi.com/f/nordic-q-a/122583/application-does-not-run-after-adding-dfu-mcu-bootHello Team, We are working on custom board using nrf54l15 platform. If we flash only application code, it works, LED is blinking &amp; BLE advertises. But after adding DFU(MCU boot) support, it does not work. We have already checked following post Enablingen-USTelligent Community 13Mon, 30 Jun 2025 08:50:26 GMTRE: Application does not run after adding DFU (MCU BOOT)https://devzone.nordicsemi.com/thread/540826?ContentTypeID=1Mon, 30 Jun 2025 08:50:26 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e0b77170-d55d-40a3-9aba-094793ecaaccAHaug<p>Hi,</p> <p>I strongly recommend you review <a href="https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/app_dev/device_guides/nrf54l/dfu_config.html">https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/app_dev/device_guides/nrf54l/dfu_config.html</a>&nbsp; and that you have a look at the BLE lesson in&nbsp;<a href="https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-9-bootloaders-and-dfu-fota/topic/exercise-5-fota-over-bluetooth-low-energy/">https://academy.nordicsemi.com/courses/nrf-connect-sdk-intermediate/lessons/lesson-9-bootloaders-and-dfu-fota/topic/exercise-5-fota-over-bluetooth-low-energy/</a>&nbsp;and cross compare this implementation to your solution for the nRF54L15.</p> <p>It&#39;s also hard to help out with anything if you don&#39;t supply more information about your project such as:</p> <ol> <li>Which SDK version are you using?</li> <li>Which SoC revision are you using?</li> <li>Do you see the same thing on a nRF54L15DK?</li> <li>Are you using an external flash?</li> <li>How did you configure MCUboot and DFU?&nbsp; <ol> <li>Can you share your prj.conf?</li> <li>Can you share your sysbuild.conf?</li> <li>Can you share your board files?</li> <li>Can you share any companion component configurations?</li> </ol> </li> </ol> <p>The case you link to is also between 1-2 years old and uses a different board than what you do, so it might not be relevant to your issue.</p> <p>If you could share an answer to all the items above I&#39;ll get back to you</p> <p>Kind regards,<br />Andreas</p><div style="clear:both;"></div>