https://devzone.nordicsemi.com/f/nordic-q-a/65769/how-to-combine-all-bl-sd-app-bl-settingHello, I&#39;m trying DFU from here . It works successfully with nRF52833 DK Board before Appendix 1. The question is how to combine all which it is bootloader + sd + application + bl-settings. I got some hex files: 1) bootloader from sdk/exampleen-USTelligent Community 13Thu, 10 Sep 2020 08:36:50 GMThttps://devzone.nordicsemi.com/thread/268877?ContentTypeID=1Thu, 10 Sep 2020 08:36:50 GMT137ad170-7792-4731-bb38-c0d22fbe4515:163adf9e-7960-47fb-9ebb-3fd141d60525Carl Richard<p><br />Hello!<br /><br />What you did here is correct! The mergehex executable supports a maximum of three files to be merged at once and will have to be invoked multiple times for additional files, as stated in the <a href="https://infocenter.nordicsemi.com/topic/ug_nrf5x_cltools/UG/cltools/nrf5x_mergehex.html?cp=9_1_2">documentation</a>.&nbsp;<br /><br />Best regards,<br />Carl Richard</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/268836?ContentTypeID=1Thu, 10 Sep 2020 05:13:44 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0fab7ba2-2b09-41f7-9142-9e55d1385258HyunSuk<p>When I did the sequence below it works. Is it right? I have not done the step 2.</p> <p><pre class="ui-code" data-mode="text">1&gt; mergehex --merge secure_bootloader_ble_s140_pca10100_debug.hex bootloader_setting.hex ble_app_hrs_pca10100_s140.hex --output hrs_bl_app.hex 2&gt; mergehex --merge hrs_bl_app.hex s140_nrf52_7.0.1_softdevice.hex --output hrs_all.hex 3&gt; nrfjprog -f NRF52 --eraseall 4&gt; nrfjprog -f NRF52 --program hrs_all.hex -r</pre></p><div style="clear:both;"></div>