https://devzone.nordicsemi.com/f/nordic-q-a/38690/problem-with-hex-filesHi, My problem is: When I programing my board using existing hex from SDK, I have no problem. Program working great. But if I building my own hex (build without errors) and send to my board, program not working. That situation refers to among other ble_app_uarten-USTelligent Community 13Thu, 20 Sep 2018 19:40:04 GMThttps://devzone.nordicsemi.com/thread/149703?ContentTypeID=1Thu, 20 Sep 2018 19:40:04 GMT137ad170-7792-4731-bb38-c0d22fbe4515:38bb861c-9ccc-4e7a-8036-4dc87af308feHeratix<p>Yes, you&#39;re right</p> <p>Thanks for help :)</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/149480?ContentTypeID=1Wed, 19 Sep 2018 14:06:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:912508e8-8204-46b6-9ec4-faff26e8af0bAmbystomaLabs<p>Likely you are forgetting to flash the corresponding softdevice to the nRF along with your program.</p> <p>The hex examples labeled xxx_S132.hex or similar already have the softdevice in them.&nbsp; When you compile you are just creating your program.&nbsp; There is no source for the SD.</p> <p>In nRFGo first write the correct SD to the nRF, then write your app to it.&nbsp; The SD&#39;s are in SDK/components/softdevice/sxxx</p><div style="clear:both;"></div>