https://devzone.nordicsemi.com/f/nordic-q-a/24112/watchdog-problem-in-dfu-modeHello, I&#39;m trying DFU/bootloader. Using nus service Switch to dfu when necessary At this time, watchdog (2 Sec) enable state does not execute the bootloader because of watchdog. However, if watchdog disabled, bootloader is executed. en-USTelligent Community 13Mon, 07 Aug 2017 13:49:07 GMThttps://devzone.nordicsemi.com/thread/94932?ContentTypeID=1Mon, 07 Aug 2017 13:49:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d40d32ff-893c-419d-968f-7e4b7a190917AmbystomaLabs<p>None of the software cares if the WDT is running. I run the wdt in our dfu code. Without looking at your code I would guess that with a 2 sec window you are not providing enough time for the software to get into dfu mode and then refresh the WDT timer before it interrupts. Make sure you are refreshing the WDT timer sufficiently early in the DFU code and probably widen WDT window.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/94933?ContentTypeID=1Mon, 07 Aug 2017 13:48:32 GMT137ad170-7792-4731-bb38-c0d22fbe4515:565d1080-fdf1-4236-9a9d-3ed16283cf5aHung Bui<p>Have you tried to search ? A simple search of &quot;watchdog DFU&quot; you can find <a href="https://devzone.nordicsemi.com/question/93577/how-to-use-the-watchdog-when-dfu/">this</a>.</p><div style="clear:both;"></div>