https://devzone.nordicsemi.com/f/nordic-q-a/17443/dfu-questionHello, I&#39;m using nRF51, SDK10, S110 beacon example with dfu service. What I have done are listed as below: merged softdevice8.0 and bootloader to sd_bl.hex and flashed it to custom module. $ nrfjprog.exe --memwr 0x03fc00 --val 0x1 $ nrfjprogen-USTelligent Community 13Tue, 01 Nov 2016 05:48:32 GMThttps://devzone.nordicsemi.com/thread/67012?ContentTypeID=1Tue, 01 Nov 2016 05:48:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:18ddd260-bd6c-4695-9266-1df08d5f7138sara<p>I found the answer here.</p> <p>(<a href="https://devzone.nordicsemi.com/question/33483/dfu-ota-firmware-image-for-production/)">devzone.nordicsemi.com/.../)</a></p><div style="clear:both;"></div>