https://devzone.nordicsemi.com/f/nordic-q-a/33788/flash-program-downloadingHi all , i&#39;m using nRF51 DK ,im getting issue while program downloading on flash .Program compiled correctly(no any error) even it show flash downloaded but the application doesnt showing effect.like i download blinky program into it.it downloaded successfullyen-USTelligent Community 13Thu, 26 Apr 2018 08:22:51 GMThttps://devzone.nordicsemi.com/thread/129891?ContentTypeID=1Thu, 26 Apr 2018 08:22:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6646c53d-3545-4c25-b665-0d88249ef5b0Martin Lesund<p>Hi Hanmanthm,</p> <p>If you are just starting out, I would recommend you to use the newest version of the SDK suited for the nRF51 series. Which is the SDK <a href="http://developer.nordicsemi.com/nRF5_SDK/nRF5_SDK_v12.x.x/" target="_blank" rel="noopener noreferrer">v12.3</a>.</p> <p>1. Use the command &#39;nrfjprog -e&#39; to erase what&#39;s on the board</p> <p>2. then follow the instructions <a href="http://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v12.3.0%2Fgetting_started_examples.html&amp;cp=4_0_6_1_2" target="_blank" rel="noopener noreferrer">here</a></p> <p>&nbsp;</p> <p>If you get the same behaviour, could you try to <a href="https://devzone.nordicsemi.com/f/nordic-q-a/10729/my-device-is-freezing-and-restarting" target="_blank" rel="noopener noreferrer">debug </a>your device to see where it hangs?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/129846?ContentTypeID=1Wed, 25 Apr 2018 16:48:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3a982515-0b82-40f7-9888-753c5617dfc3hanmanthm<p>Yes i checked all things from list.</p> <p>My DK status is like,&quot;Connected properly and also showing JLINK too in my computer .it goes ok when i copy paste the hex file to that JLINK folder(my application) but when im trying to&nbsp; &nbsp;download&nbsp; int flash it doesnot&nbsp; showup any affects(as&nbsp; per my application).so how can solve this&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/129791?ContentTypeID=1Wed, 25 Apr 2018 13:39:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:54ccc2f9-7ca9-45d7-9f84-ed4df874c14aMartin Lesund<p>Hi Hanmanthm,</p> <p>&nbsp;Have you gone through this <a href="https://devzone.nordicsemi.com/f/nordic-q-a/24592/my-nrf52-nrf51-dk-kit-doesn-t-work" target="_blank" rel="noopener noreferrer">list</a>`?</p><div style="clear:both;"></div>