https://devzone.nordicsemi.com/f/nordic-q-a/25470/flashing-eddystone-firmware-on-custom-boardHello Folks, Nice to see an active developer community out here! I ran into some issues last night which I hope could be resolved. We procured nRF52840 SoCs and have developed a low-cost custom board recently. As its a very initial prototype we donen-USTelligent Community 13Wed, 27 Sep 2017 13:07:28 GMThttps://devzone.nordicsemi.com/thread/100375?ContentTypeID=1Wed, 27 Sep 2017 13:07:28 GMT137ad170-7792-4731-bb38-c0d22fbe4515:75ad3d11-37b5-44b4-9092-e09e0605598eHung Bui<p>My suggestion is that you test with simple example first. For example ble_app_hrs example. Make sure you flash the softdevice before you flash the example (or you can flash the pre-compiled hex which includes the softdevice already).</p> <p>You may have to modify the source code if you don&#39;t have the 32kHz crystal on your custom board.</p> <p>Did the blinky example work for you ?</p><div style="clear:both;"></div>