https://devzone.nordicsemi.com/f/nordic-q-a/43534/how-to-use-dfu-function-in-nrf52-dkMy working platform is nRF52-DK, and I want to execute DFU firmware upgrade 1. How to create a Bootloader Image? Which Source-Code of SDK_15_2 is used to build the bootloader code? 2. Since I am using an older version of SEGGER Jlink, I can only useen-USTelligent Community 13Mon, 11 Feb 2019 10:09:35 GMThttps://devzone.nordicsemi.com/thread/170306?ContentTypeID=1Mon, 11 Feb 2019 10:09:35 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6b0421ec-d6de-4664-91a6-2c906b9cae78Hung Bui<p>Hi Ives,&nbsp;</p> <p></p> <p>How old is your Jlink, we are still using the Jlink Lite from 8 years ago and having no problem.&nbsp;</p> <p>I would suggest you to follow my blog <a href="https://devzone.nordicsemi.com/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader">here </a>on how to get started with the bootloader.&nbsp;</p><div style="clear:both;"></div>