https://devzone.nordicsemi.com/f/nordic-q-a/84846/bootloader-application-dfu-packageWe are using the Nordic iOS and Android DFU libraries to perform firmware updates of a nRF52840. When I attempt to use nrfutil pkg generate to create a DFU package that contains an only an application and a bootloader I get the following error messageen-USTelligent Community 13Tue, 01 Feb 2022 14:02:08 GMThttps://devzone.nordicsemi.com/thread/353475?ContentTypeID=1Tue, 01 Feb 2022 14:02:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:313eb0f9-4d20-4f37-aa99-381a8604f4adJackson Burnette<p>Thanks very much Einar</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/353474?ContentTypeID=1Tue, 01 Feb 2022 08:11:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:75c7f048-7573-4155-b5a2-f734836d0f6aEinar Thorsrud<p>Hi&nbsp;Jackson,</p> <p>There may be a historic reason for this limitation, but at least for recent SDK versions this should work as you have found. It is not supported though, meaning we do not test it. And as this operation is split in two by the DFU master, this would effectively be the same as using two separate zip files, one with the application and one with the bootloader (which you could then zip up and extract again in your app without the end user ever seeing it).</p> <p>The consequence of manually creating the package with application + bootloader is that you are using a combination that we never do in release testing of the SDK or our tools, so you need to be even more careful to test this properly on your end.</p> <p>Br,</p> <p>Einar</p><div style="clear:both;"></div>