https://devzone.nordicsemi.com/f/nordic-q-a/119355/trouble-migrating-from-ncs-2-7-to-2-9trying to build matter sample example light_bulb but getting error : nRF connect sdk v2.9.0 &amp; tool chain v2.9.0 using board nrf21540dk/nrf52840 following are the building logs prj.conf file with error how i can solve this erroren-USTelligent Community 13Thu, 27 Feb 2025 13:52:28 GMThttps://devzone.nordicsemi.com/thread/525083?ContentTypeID=1Thu, 27 Feb 2025 13:52:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5049bc97-8b88-4231-bf92-120ad80f4b39Amanda Hsieh<p><span>nRF21540DK does not have the external flash for DFU. Please use sysbuild and&nbsp;build for nRF52840DK with nRF2140EK. See the&nbsp;</span><a href="https://docs.nordicsemi.com/bundle/ncs-latest/page/nrf/samples/matter/light_bulb/README.html#fem_support">FEM support</a>&nbsp;section.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/524957?ContentTypeID=1Thu, 27 Feb 2025 03:43:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5c7c2f2f-300f-4f3c-b859-cf126a0b4f8bPrajwal Tayade<p>i didn&#39;t modified anything in matter sample example,&nbsp;</p> <p>as you told use sysbuild still error not solve.</p> <p><img alt=" " height="382" src="https://devzone.nordicsemi.com/resized-image/__size/700x764/__key/communityserver-discussions-components-files/4/Screenshot-from-2025_2D00_02_2D00_27-09_2D00_06_2D00_54.png" width="350" /></p> <p></p> <p><img style="max-height:362px;max-width:585px;" alt=" " height="362" src="https://devzone.nordicsemi.com/resized-image/__size/1170x724/__key/communityserver-discussions-components-files/4/Screenshot-from-2025_2D00_02_2D00_27-09_2D00_07_2D00_52.png" width="585" /></p> <p></p> <p><a href="https://devzone.nordicsemi.com/cfs-file/__key/communityserver-discussions-components-files/4/7416.light_5F00_bulb_5F00_v2.9.0.txt">devzone.nordicsemi.com/.../7416.light_5F00_bulb_5F00_v2.9.0.txt</a></p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/524914?ContentTypeID=1Wed, 26 Feb 2025 17:51:31 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8114cdd1-f85a-4d90-bd6d-18db381af752Amanda Hsieh<p>Hi,&nbsp;</p> <p>Are you using the unmodified&nbsp;<span>matter sample example light_bulb? If so,&nbsp;</span><span>could you try building for nRF52840DK with EK and use Sysbuild?</span></p> <p><span><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1740592263644v2.png" alt=" " /></span></p> <p>Regards,<br />Amanda H.</p><div style="clear:both;"></div>