https://devzone.nordicsemi.com/f/nordic-q-a/16880/secure-dfu-sdk-12Hi, I just upgraded to the new SDK (12.1) from SDK 11... and I&#39;m completely lost about the new secure DFU... Previously I correctly implemented a buttonless DFU in my application so it will reset the chip and start de Bootloader, but now I&#39;m tryingen-USTelligent Community 13Thu, 06 Oct 2016 17:24:20 GMThttps://devzone.nordicsemi.com/thread/64666?ContentTypeID=1Thu, 06 Oct 2016 17:24:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ec5e39ee-f49f-4cad-99e4-da03a4dcca79WestCoastDaz<p>Check this post <a href="https://devzone.nordicsemi.com/question/93241/what-are-sdk-12x0-known-issues/">devzone.nordicsemi.com/.../</a> It seems like the buttonless DFU example is missing has a bug. I&#39;m not sure if it was fixed in SDK 12.1</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/64665?ContentTypeID=1Thu, 06 Oct 2016 14:52:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:47851482-9ad7-443f-a311-06192365e06bFormerMember<p>To check which areas in the chip that are programmed, you can also use nrfjprog from cmd. If your bootloader starts at address 0x78000, and you want to read 100 bytes, you can use the following command:</p> <pre><code>nrfjprog --memrd 0x78000 --n 100 -f nrf52 </code></pre> <p>Programming the application should not erase anything else than overwriting the area it is writing to.</p><div style="clear:both;"></div>