https://devzone.nordicsemi.com/f/nordic-q-a/4353/not-running-applicationi try to test Low Energy Applications Using nRF51822 with application note ( nAN-36 ) in chapter 4 : led button example, build and install success~!, but, not running application. so, i download source code from github, however, same result. normallyen-USTelligent Community 13Fri, 07 Nov 2014 08:51:52 GMThttps://devzone.nordicsemi.com/thread/15488?ContentTypeID=1Fri, 07 Nov 2014 08:51:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:54bee920-1c5f-4e35-8a50-6043386b79a9Stian R&#248;ed Hafskjold<p>Which SDK version are you using? Did you see the fix for SDK 6.0.0 on GitHub? <a href="https://github.com/NordicSemiconductor/nrf51-ble-app-lbs/tree/SDK6.0">github.com/.../SDK6.0</a></p> <p>You wrote: &quot;but application note&#39;s app shows log without &quot;application running...&quot; &quot;</p> <p>Is you problem that the application does not run at all? Or are you wondering why the log in the application note does not contain &quot;Application running&quot;? In the last case, it&#39;s because it is run in debug mode (Ctrl + F5)</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/15487?ContentTypeID=1Thu, 06 Nov 2014 08:29:03 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0fad4dff-6660-458d-afed-a78c9bf20364Asbj&#248;rn<p>Did you program the softdevice into the chip as well? The led button example will be installed above the softdevice in flash and if the softdevice isn&#39;t there, your code will not start.</p><div style="clear:both;"></div>