https://devzone.nordicsemi.com/f/nordic-q-a/17257/dfu-without-bootloaderHi - I have been unsuccessful using Master Control Panel 3.10.0.14 on win10 to send a new application to a pca10028 with running initial application that supports DFU. What am I doing wrong? Here is what I am trying: Use nRFgoStudio 1.21.2.10en-USTelligent Community 13Tue, 25 Oct 2016 12:38:54 GMThttps://devzone.nordicsemi.com/thread/66286?ContentTypeID=1Tue, 25 Oct 2016 12:38:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:498ea8fa-5d88-4b9e-82c7-4e474b1915a9bjorn-spockeli<p>You need to flash <strong>both</strong> the bootloader and the application with DFU support in order to be able to perform DFU.</p> <p>Both the bootloader and the application with DFU support will advertise the same service, but they do not have the same capabilities.</p> <p>An application with DFU support will only branch to the bootloader when it receives the start DFU command is sent to the DFU control point. Its the bootloader that does the actual update, i.e. receives the init packet, the data packets and writes the firmware to flash.</p> <p>Best regards</p> <p>Bjørn</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/66287?ContentTypeID=1Mon, 24 Oct 2016 09:33:46 GMT137ad170-7792-4731-bb38-c0d22fbe4515:8b1732d0-25a6-47c3-99ae-0f77d3459d86Lummy<p>To use DFU over the air, you must make a .zip file using mergehex.exe.</p><div style="clear:both;"></div>