https://devzone.nordicsemi.com/f/nordic-q-a/14769/nrfgostudio-does-not-connect-with-nrf51-dk-boardHi, I have used nRF51 DK board for 6 months well. Then now, it isn&#39;t connected with nRFgoStudio since I have upgraded nRFgoStudio about 1 month ago. Error message is no response connection_error.jpg So if I select &#39;yes&#39; nRFgoStudio display asen-USTelligent Community 13Mon, 27 Jun 2016 06:27:17 GMThttps://devzone.nordicsemi.com/thread/56400?ContentTypeID=1Mon, 27 Jun 2016 06:27:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3911d76f-7ccc-471a-bf9f-8c10f2a789da&#216;yvind Karlsen<p>Hi,</p> <p>Try following the steps described at the top of <a href="https://devzone.nordicsemi.com/blogs/856/keil-nrfjprog-true/">this blogpost</a> to get started with the command line tools, we have found them to be more reliable across software version changes.</p> <p>Best regards,</p> <p>Øyvind</p><div style="clear:both;"></div>