https://devzone.nordicsemi.com/f/nordic-q-a/6843/nrf-exe-dfu-genpkg-helpAlright, so I am having a lot of trouble generating a valid zip file to update with nRF Toolbox (android). I used nRFgo Studio to flash dfu_test_app_hrm.hex and dfu_test_bootloader_b.hex (from examples\dfu\ble_dfu_send_hex\test_images_update). Withen-USTelligent Community 13Mon, 04 May 2015 12:25:33 GMThttps://devzone.nordicsemi.com/thread/24118?ContentTypeID=1Mon, 04 May 2015 12:25:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7b93a069-fab2-4ece-868f-24c636704d27Hung Bui<p>@Chris: application_version is a required field as defined <a href="https://developer.nordicsemi.com/nRF51_SDK/nRF51_SDK_v8.x.x/doc/8.0.0/s110/html/a00093.html">here</a>. Regardless what you are updating (application, bootloader, softdevice) we use the same format for initpacket. So what you should add to the command is</p> <p>--application-version 0xFFFFFFFF</p> <p>Secondly, the code for &quot;any softdevice&quot; should be --sd-req 0xfffe , not --sd-req 0xffff</p><div style="clear:both;"></div>