https://devzone.nordicsemi.com/f/nordic-q-a/119951/unable-to-flash-code-in-custom-board-with-nrf52840we have 6 custom board with nRF52840 we are able to flash test codes in 2 boards , while 4 boards give Error :No Cortex-M SW Device Found . this is in nrf sdk . when we connect the boards in nRF connect for desktop the following error msg is founden-USTelligent Community 13Wed, 19 Mar 2025 12:54:33 GMThttps://devzone.nordicsemi.com/thread/528007?ContentTypeID=1Wed, 19 Mar 2025 12:54:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9cec9c66-5165-44d7-83af-13be560e3841H&#229;kon Alseth<p>Hi,</p> <p>&nbsp;</p> <p>If 4 out of 6 is not working, it indicates that there might be a problem with the boards themselves. Have you checked the soldering and other connections on the board itself?</p> <p>&nbsp;</p> <p>Kind regards,</p> <p>Håkon</p><div style="clear:both;"></div>