https://devzone.nordicsemi.com/f/nordic-q-a/125783/problem-configuring-mcuboot-nrf54l15-ncs-3-0-1Dear Team, I need to switch LXFO to internal RC for MCUBoot, however, I am experiencing troubles configuring it on NCS 3.0.1 (NRF54L15). If I just add my RC settings to [approot]/sysbuild/mcubuild.conf, the west build fails saying that it can&#39;t finden-USTelligent Community 13Mon, 24 Nov 2025 12:25:54 GMThttps://devzone.nordicsemi.com/thread/555203?ContentTypeID=1Mon, 24 Nov 2025 12:25:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7c167183-26a0-43fa-bbad-d200889ab837Vidar Berg<p>Hi Alex,</p> [quote user=""]If I just add my RC settings to [approot]/sysbuild/mcubuild.conf, the west build fails saying that it can&#39;t find[/quote] <p>Maybe it&#39;s just a typo here, but please ensure you&#39;re naming the kconfig fragment correctly. It shall be &quot;mcuboot.conf&quot; not &quot;mcubuild.conf&quot;. Also, when you are only supplying the fragment to overlay the default settings, ensure you don&#39;t have any directory named &quot;mcuboot&quot; under sysbuild.</p> <p>Best regards,</p> <p>Vidar</p><div style="clear:both;"></div>