https://devzone.nordicsemi.com/f/nordic-q-a/11077/board-again-starts-in-boot-modeHii all, I am trying to work with dfu, I developing an application that works with dfu, when I flash the softdevice and bootloader the device advertising as dfutarg and then I programming my application it works well, and if I try to update the firmwareen-USTelligent Community 13Fri, 22 Jan 2016 18:15:38 GMThttps://devzone.nordicsemi.com/thread/41436?ContentTypeID=1Fri, 22 Jan 2016 18:15:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:abf71164-f8b7-4b82-a6cb-083d6392bab1Pavan kumar<p>Yes That is what the problem exactly in the custom board initially the BOOTLOADER_BUTTON is pulled low</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/41435?ContentTypeID=1Wed, 30 Dec 2015 03:12:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:f19d0366-8927-4399-b65f-23c452fb69e6caram5555<p>Hi Pavan kumar. Did you checked dfu hold status key(BOOTLOADER_BUTTON) is pressed? When this key is pressed it still remains in dfu status. Or please check code region 0 is valid.</p> <p>A member of Mobilian (<a href="http://www.mobilian.biz)">http://www.mobilian.biz)</a></p><div style="clear:both;"></div>