https://devzone.nordicsemi.com/f/nordic-q-a/35104/bootloader-in-light-switch-exampleHellou, I am developing apllication mesh application from example light switch. In application program i receive data from mesh and this data is stored to external serial flash with SPI driver. This data will be new data from hexfile for applicationen-USTelligent Community 13Wed, 06 Jun 2018 12:14:42 GMThttps://devzone.nordicsemi.com/thread/134931?ContentTypeID=1Wed, 06 Jun 2018 12:14:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:52dba108-88f6-4cac-b1f6-d5563fa07912Bj&#248;rn Kvaale<p>Have you taken a look at the <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.meshsdk.v2.0.1/md_examples_dfu_README.html?cp=4_1_0_4_5">dfu example in the mesh sdk</a>? Not sure if this is the correct example for your use case, but it might be a good starting point. <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.s132.sds/dita/softdevices/s130/mbr_bootloader/mbr_sd_reset_behavior.html?cp=2_3_1_0_11_2">This link</a> could also be helpful. When you say that the softdevice is the only hex file, do you mean that you do not have an application programmed on your nrf52? Or are you only updating the softdevice in your dfu application?</p><div style="clear:both;"></div>