https://devzone.nordicsemi.com/f/nordic-q-a/112610/integration-bootloader-with-central-uart1. HI currently i am using nrf52840 s140 sdk ver 17.1.0 i have integrted the secure boorloader /pca10056_ble sdk with central uart after merging i have faced run time error we need dfu ota for my main central uart app so thats why i am integrating toen-USTelligent Community 13Thu, 08 Aug 2024 05:41:24 GMThttps://devzone.nordicsemi.com/thread/497408?ContentTypeID=1Thu, 08 Aug 2024 05:41:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:58d1a415-a65d-4828-a100-c024f19d7ad9AP1<p>Hi i have used 2 separate projects with the separate flash address for bootloader and central uart now i can able to trigger dfu form central uart</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/491634?ContentTypeID=1Mon, 01 Jul 2024 13:59:23 GMT137ad170-7792-4731-bb38-c0d22fbe4515:bc10a0ba-850d-41a2-8d7c-6f22770d981bSigurd<p>Hi!</p> [quote user=""] have integrted the secure boorloader /pca10056_ble sdk with central uart after merging[/quote] <p>This is not the way to do it.</p> <p>You keep the bootloader project and your application project as 2 separate projects. The code generated will reside in different parts of the flash, and you get 2 hex files(your app and the bootloader) that you flash to the device.&nbsp;</p> <p>If you are new to the bootloader see this guide:&nbsp;&nbsp;<a href="https://devzone.nordicsemi.com/guides/short-range-guides/b/software-development-kit/posts/getting-started-with-nordics-secure-dfu-bootloader">Getting started with Nordic&#39;s Secure DFU bootloader, a step by step guide</a></p> <p></p> <p>PS: If this is a new project, then consider using nRF Connect SDK instead:&nbsp;&nbsp;<a href="https://devzone.nordicsemi.com/nordic/nordic-blog/b/blog/posts/nrf-connect-sdk-and-nrf5-sdk-statement">nRF Connect SDK and nRF5 SDK statement</a>&nbsp;</p><div style="clear:both;"></div>