https://devzone.nordicsemi.com/f/nordic-q-a/65918/nrf52840---led-1-not-flashing-upon-startupHi, I&#39;m a beginner in working with these Nordic Development Kits. I&#39;ve been following the steps outlined on the Nordic website for getting started with a nRF52840 DK. It tells me that after I&#39;ve connected the DK to the PC and turned it on, LED 1 shoulden-USTelligent Community 13Tue, 15 Sep 2020 06:52:55 GMThttps://devzone.nordicsemi.com/thread/269524?ContentTypeID=1Tue, 15 Sep 2020 06:52:55 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8cc95a0d-813f-4063-851f-54bc48a70969Marte Myrvold<p>Hi,</p> <p>As you&#39;re new with Nordic DKs I would recommend taking a look at the getting started page for the nRF5 SDK, which can be found&nbsp;<a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/nrf51_getting_started.html">here</a>. If you haven&#39;t downloaded the SDK yet, you can find it&nbsp;<a href="https://www.nordicsemi.com/Software-and-Tools/Software/nRF5-SDK/Download">here</a>.</p> <p>In your case you want to run a precompiled example, the preflash example. To see how to run it, you can check out&nbsp;<a href="https://infocenter.nordicsemi.com/topic/sdk_nrf5_v17.0.2/getting_started_precompiled.html">this link</a>, and follow the guide there. You can either use the preflash example as in your picture, or another example that has a precompiled hex file. Since you have a nRF52840 DK, you should use the file that ends with pca10056_hex.</p> <p>If you later want information about how to compile and run examples that are not precompiled, you can find links with guides for this on the getting started page I linked above.</p> <p>Best regards,</p> <p>Marte</p><div style="clear:both;"></div>