https://devzone.nordicsemi.com/f/nordic-q-a/12255/bootloader-and-debug-of-applicationHello, When i have a bootloader installed and i try to debug application, it doesn&#39;t start application probably because debugger programmed application without the right headers. Is there any way to detect that a SWD probe is connected to bypass headeren-USTelligent Community 13Sat, 12 Mar 2016 14:23:08 GMThttps://devzone.nordicsemi.com/thread/46356?ContentTypeID=1Sat, 12 Mar 2016 14:23:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6ee08d2b-6c0a-4e9a-98c0-2e904f396197Fabien Comte<p>Thank you it works.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/46355?ContentTypeID=1Wed, 02 Mar 2016 10:54:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:624ff794-2400-4bcb-a8af-9b4908860bfaVidar Berg<p>Hello,</p> <p>The bootloader will go into DFU mode on startup if the &quot;app valid&quot; flag isn&#39;t set. This flag will be set when doing bootloader DFU, but has to be done manually when using a programmer. Please have a look at answer &#39;E&#39; in this <a href="https://devzone.nordicsemi.com/blogs/685/common-faq-on-dfu/">FAQ</a> for more details.</p><div style="clear:both;"></div>