https://devzone.nordicsemi.com/f/nordic-q-a/1013/about-the-dfuHi All, Now I&#39;m doing the OTA and I can use the nRF51822 DK and Master Control Pannel to complete the firmware update.I have a idear but I meet some problem. I use the nrfjprog program the softdevice and bootloader,then I program the applicationen-USTelligent Community 13Wed, 27 Nov 2013 16:16:25 GMThttps://devzone.nordicsemi.com/thread/4789?ContentTypeID=1Wed, 27 Nov 2013 16:16:25 GMT137ad170-7792-4731-bb38-c0d22fbe4515:547c9157-5b9b-4d37-a827-a2823415badePetter Myhre<p><a href="http://devzone.nordicsemi.com/index.php/device-is-always-in-bootloader-mode#reply-2308">This</a> thread might also be useful.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/4788?ContentTypeID=1Wed, 27 Nov 2013 16:13:01 GMT137ad170-7792-4731-bb38-c0d22fbe4515:96de4824-3029-4a76-8758-6ed09ae4355fOle Morten<p>Take a look at <a href="https://devzone.nordicsemi.com/index.php/firmware-update-without-button-press#reply-2318">this reply</a>.</p><div style="clear:both;"></div>