https://devzone.nordicsemi.com/f/nordic-q-a/115898/problem-flashing-the-hex-file-onto-the-nrf52840-microcontrollerHello everyone, I took the example code &quot;ble_app_hrs&quot; and added a pin toggle to verify that the code is loaded correctly onto my custom board, which is programmed via the evaluation board 10056 (v2.0.1) and through the P19 connector (Debug Out). I noticeden-USTelligent Community 13Tue, 29 Oct 2024 15:33:58 GMThttps://devzone.nordicsemi.com/thread/508404?ContentTypeID=1Tue, 29 Oct 2024 15:33:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:428f23fd-bb00-48fe-b3b1-66d7c8a94745Kazi Afroza Sultana<p>Hello&#39;&#39;</p> <p>&#39;&#39;When I try to flash the code on the evaluation board, initially it doesn&#39;t work (not even pressing the reset button), but if I remove the power from the board and then restore it, the code starts working. Why is that?&#39;&#39;</p> <p>On which board you were trying to run the example? Your target board should be your custom board.&nbsp;</p> <p>If you have J-link commander, you can follow the following command to&nbsp;set&nbsp;connected microcontroller</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1730214951454v2.png" alt=" " /></p> <p>I have tried to run the default example on our nRF5SDK and it worked. You can see the directory (C:\nordic\SDKv17.1.0\nRF5_SDK_17.1.0_ddde560\examples\ble_peripheral\ble_app_hrs\pca10056\s140\ses\Output\Release\Exe)</p> <p><img style="max-height:240px;max-width:320px;" src="https://devzone.nordicsemi.com/resized-image/__size/640x480/__key/communityserver-discussions-components-files/4/pastedimage1730215600688v3.png" alt=" " /></p><div style="clear:both;"></div>