https://devzone.nordicsemi.com/f/nordic-q-a/56193/steps-to-add-buttonless-dfu-to-my-applicationHi, im usinh SDK V 15.3 i was following the tutorial to add buttonless dfu to my application code https://infocenter.nordicsemi.com/index.jsp?topic=%2Fcom.nordic.infocenter.sdk5.v11.0.0%2Fbledfu_appextending.html but i coudnt locate any bootloader_util_armen-USTelligent Community 13Mon, 06 Jan 2020 15:11:00 GMThttps://devzone.nordicsemi.com/thread/227735?ContentTypeID=1Mon, 06 Jan 2020 15:11:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b88337f9-9a09-47a9-bd40-6415a7c630a6Einar Thorsrud<p>Hi,</p> <p>The documentation you link to is for SDK 11, which is quite different from SDK 15.3. The relevant documentation that describes how to add buttonless DFU to the application for SDK 15.3 is found <a href="https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v15.3.0/service_dfu.html">here</a>.</p><div style="clear:both;"></div>