https://devzone.nordicsemi.com/f/nordic-q-a/19956/program-custom-board-with-nrf52832Hello! I know there&#39;re a lot of questions about program custom board. I try to programm my board used onboard j-link (p19 socket) I can&#39;t pass the first step - can&#39;t force j-link to detect external chip. It&#39;s all the time programm internal chip. Theen-USTelligent Community 13Fri, 24 Feb 2017 11:53:45 GMThttps://devzone.nordicsemi.com/thread/77653?ContentTypeID=1Fri, 24 Feb 2017 11:53:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8f6c7f3d-0c0b-4174-9201-b6d2fc6f4106endnode<p>I do use P19 as well but only if I have full JTAG/SWD 10-pin connector on the other side and all lines are connected properly so SEGGER J-Link OB detects it and flashes external target not internal nRF5x chip on the DK. If I&#39;m not sure that P19 detection works for particular custom board I switch to P20 where I can &quot;force&quot; detection by shorting two PINs...</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/77652?ContentTypeID=1Fri, 24 Feb 2017 04:14:48 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3eebc756-fa02-47c2-aba3-0eceba9d4986Stas<p>I solved problem using p20 connector instead of p19 thanking for <strong>Endnode&#39;s</strong> answer in this post: <a href="https://devzone.nordicsemi.com/question/89634/nrf51822-minews-module-is-not-recognized-by-nrf51dk/?answer=89701#post-id-89701">devzone.nordicsemi.com/.../</a></p><div style="clear:both;"></div>