https://devzone.nordicsemi.com/f/nordic-q-a/15544/nrf51-brick-after-dfu-interrupted-at-100I tried if there is a possibility that my device would brick if I interrupt the DFU process. notice that I&#39;m using SDK10 with dual bank bootloader. I uploaded the app over the air many times, when I interrupt the process in the middle of transfer, theen-USTelligent Community 13Thu, 04 Aug 2016 11:19:07 GMThttps://devzone.nordicsemi.com/thread/59344?ContentTypeID=1Thu, 04 Aug 2016 11:19:07 GMT137ad170-7792-4731-bb38-c0d22fbe4515:15ef2d96-7ce5-4fb0-b3f1-62e08415d965Hung Bui<p>@makouda: How do you start the bootloader ? by reset and holding a button or by entering via application and a command from the central device ? Have you looked at question A in <a href="https://devzone.nordicsemi.com/blogs/685/common-faq-on-dfu/">this FAQ</a> ?</p> <p>What you can do also is to dump the hex file out and check what has been updated and what &#39;s not and see what went wrong. You can also run the bootloader in debug mode and step through the code to see what happens when booting up the board.</p><div style="clear:both;"></div>