https://devzone.nordicsemi.com/f/nordic-q-a/47767/version-number-meaning-when-generating-bootloader-settingsHi there, I could not find any documentation about the meaning of the version numbers, when creating bootloader settings: nrfutil settings generate --family NRF52840 --application app.hex --application-version 3 --bootloader-version 2 --bl-settingsen-USTelligent Community 13Mon, 27 May 2019 13:17:13 GMThttps://devzone.nordicsemi.com/thread/189347?ContentTypeID=1Mon, 27 May 2019 13:17:13 GMT137ad170-7792-4731-bb38-c0d22fbe4515:06b4d0f9-34b0-43a8-9eae-908f7ad3d328Hung Bui<p>Hi Sammy,&nbsp;</p> <p>Except for bootloader setting version &quot;<span>--bl-settings-version&quot; , the other versions are application defines. The rule is that application version of the new image has to be &gt;= the current application , and the bootloader version of the new image has to be &gt; the current bootloader version. It&#39;s discussed a little bit <a href="https://devzone.nordicsemi.com/nordic/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader">here in my blog</a>, at step C.&nbsp;</span></p> <p><span></span></p> <p><span>Regarding bootloader setting version, you may find some more information by typing: &quot;nrfutil settings generate --help&quot;. It&#39;s not for the application to choose but mount to the SDK.</span></p> <p><span> Basically from SDK v15.3 we added a bootloader setting back up page. If you use SDK v15.2 or earlier, you should use&nbsp;<span>--bl-settings-version = 1.&nbsp;</span></span></p> <p><span></span></p> <p><span></span></p><div style="clear:both;"></div>