https://devzone.nordicsemi.com/f/nordic-q-a/78286/bootloader-isn-t-advertising-dfutargHi, I&#39;m trying to build secure bootloader DFU(non_debug_version) for PCA10040 with the below mentioned prerequisites and I&#39;m able to build the bootloader successfully. When I write the .hex files of bootloader and soft device using nRF connect programmeren-USTelligent Community 13Fri, 06 Aug 2021 12:00:17 GMThttps://devzone.nordicsemi.com/thread/323723?ContentTypeID=1Fri, 06 Aug 2021 12:00:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:87a4002b-786a-4ada-9dbf-c43b524f3d9aHung Bui<p>Hi Anil,&nbsp;</p> <p>When there is something that doesn&#39;t work, please try to debug it and gather as much as possible information about the bug. We can&#39;t help with the only information is that it doesn&#39;t advertise.&nbsp;</p> <p>Please try to test with the debug version so it&#39;s easy to debug. Make sure to do an eraseall of the flash before testing.&nbsp;</p> <p>Have you done any modification to the bootloader ?&nbsp;</p><div style="clear:both;"></div>