https://devzone.nordicsemi.com/f/nordic-q-a/34035/programming-external-board-nrf51822-qfac-with-nrf51dk-kiel-configuration-softdevice-sdk-nothings-workingHi there.. I&#39;ve recently jumped back on development of a board I had made a while ago but have forgotten everything and am starting from scratch as computer was reformatted since then. Goal: getting a custom program to program blinky example, alsoen-USTelligent Community 13Fri, 04 May 2018 21:26:23 GMThttps://devzone.nordicsemi.com/thread/131063?ContentTypeID=1Fri, 04 May 2018 21:26:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:88bfa572-7e6c-49e7-a31f-f884665a9880kylobyte<p>You guys are good!,&nbsp; I think the most fustrating problems are cable problems because you end up going through every other possible solution first... anyways, I made a new cable and it works.&nbsp; man thats annoying.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/130927?ContentTypeID=1Fri, 04 May 2018 07:24:47 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cb1ac701-78cc-4bcf-a6f9-feafb84965e2Vidar Berg<p>Hi,&nbsp;</p> <p>You are using revision 3 of the 51, which is identical to the variant used on the 51 DK. Here is the compatibility matrix for reference:&nbsp;<a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf51/dita/nrf51/compatibility_matrix/nRF51822_ic_revision_overview.html?cp=3_0_1">http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf51/dita/nrf51/compatibility_matrix/nRF51822_ic_revision_overview.html?cp=3_0_1</a>.</p> <p>I think this more likely to be a wiring problem. Did you connect SH_VTG (Jlink pin to detect target voltage) to VDD? The J-link will not attempt to program the chip otherwise.</p> <p>&nbsp;</p> <p><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/support-attachments/beef5d1b77644c448dabff31668f3a47-c534740c2d224451bbe305ba8de36898/pastedimage1525418521596v1.png" alt=" " /></p><div style="clear:both;"></div>