CPU not seen with nRF51 DKhttps://devzone.nordicsemi.com/f/nordic-q-a/6685/cpu-not-seen-with-nrf51-dkI haven&#39;t seen any posts about this, so I thought I&#39;d post what I observed and how I fixed it in the hope this helps someone else. My nRF51 DK (PCA10028 v1.1.0) out of the blue stopped accepting new programming. That is, I could see the JLink targeten-USTelligent Community 13Thu, 23 Apr 2015 22:46:56 GMTRE: CPU not seen with nRF51 DKhttps://devzone.nordicsemi.com/thread/23447?ContentTypeID=1Thu, 23 Apr 2015 22:46:56 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7085ede5-9978-45ce-8260-3d88fc37d55eNick Pelis<p>Like they always tell you in tech support, if all else fails, reset!</p><div style="clear:both;"></div>RE: CPU not seen with nRF51 DKhttps://devzone.nordicsemi.com/thread/23446?ContentTypeID=1Thu, 23 Apr 2015 18:28:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:87030c78-1853-4fd2-a161-9e20bce8b2e2Susheel Nuguru<p>I guess your chip was in &quot;Nirvana&quot; state and you managed to wake it up with your charm. Smart thinking and I will remember this for the future and thanks a lot for taking your time to let others know of this solution. We really appreciate that. +1 point to your from me.</p><div style="clear:both;"></div>