https://devzone.nordicsemi.com/f/nordic-q-a/15595/problem-with-combining-peripheral-and-central-dfu-with-fdsHello, for my project I&#39;m using: SDK11, s130, nrf51 (nrf51822-QFAC), central and peripheral roles, DFU. I&#39;ve managed to have both peripheral and central roles with DFU with solution taken from this post: devzone.nordicsemi.com/.../ I wanted toen-USTelligent Community 13Tue, 09 Aug 2016 19:23:12 GMThttps://devzone.nordicsemi.com/thread/59504?ContentTypeID=1Tue, 09 Aug 2016 19:23:12 GMT137ad170-7792-4731-bb38-c0d22fbe4515:21811bae-3890-4d65-ab66-722d019df8e4adriand<p>ok, most likely defining DFU_APP_DATA_RESERVED was the case. I preserved 0x400 and now it works fine with FDS :-) when I debug it before I was getting error 0x03 (internal error). Thanks!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/59503?ContentTypeID=1Mon, 08 Aug 2016 15:06:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:34a9e078-1a30-4eae-a8fa-7bb54aa9cad8Ole Bauck<p>Most likely the reset is because of an error condition, try to define DEBUG in the preprocessor symbols and see if the application stops and if so where the error came from and what error code it is. See this: <a href="https://devzone.nordicsemi.com/question/60125/my-device-is-freezing-and-restarting/">devzone.nordicsemi.com/.../</a></p> <p>You can also try to define DFU_APP_DATA_RESERVED as f.ex. 0x400 in the bootloader project and see if it helps, see this: <a href="http://infocenter.nordicsemi.com/topic/com.nordic.infocenter.sdk5.v11.0.0/bledfu_memory_appdata.html">infocenter.nordicsemi.com/.../bledfu_memory_appdata.html</a></p><div style="clear:both;"></div>