https://devzone.nordicsemi.com/f/nordic-q-a/6338/trouble-programming-custom-board---nrfjprog-dll-errorHello, I have built a couple of custom boards in the past using the nRF51822 and have stuck very closely to the reference designs. They have all worked. In my latest board, I created a new design for a new application and after assembling the boarden-USTelligent Community 13Fri, 03 Apr 2015 22:47:04 GMThttps://devzone.nordicsemi.com/thread/22104?ContentTypeID=1Fri, 03 Apr 2015 22:47:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:056ad650-c3c0-42c7-bc06-088cd68456e4Siddhartho Bhattacharya<p>Solved, it was of course a hardware issue. The 2 Capacitors at the top of the schematic &quot;On VDD&quot; should be 100 nF not 100 pF</p><div style="clear:both;"></div>