https://devzone.nordicsemi.com/f/nordic-q-a/48875/dfu-over-uart-in-nrf58210I am working on a project to do serial uart dfu in nrf52810. For that purpose i will be writing c code equivalent to nrfutil. I was going through all documentation and tried to execute those examples.But nothing worked.Even after doing all bootloaderen-USTelligent Community 13Mon, 24 Jun 2019 12:07:49 GMThttps://devzone.nordicsemi.com/thread/194347?ContentTypeID=1Mon, 24 Jun 2019 12:07:49 GMT137ad170-7792-4731-bb38-c0d22fbe4515:866e0dc7-cfda-432f-b46d-199df787053dHung Bui<p>Hei,</p> <p>I would suggest to go step by step, first you would need to try updating just the application first.&nbsp;</p> <p>Have you managed to do DFU update using nrfutil and update just the application ? You can follow the tutorial <a href="https://devzone.nordicsemi.com/nordic/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader">here</a>. The tutorial made for nRF52832 but for nRF52810 you just need to adjust the Flash.&nbsp;</p> <p>I assume you are making the C code to do DFU master. To do that you would need to follow the DFU protocol closely. I would suggest to capture a DFU session from nrfutil to have an overview of how it works and then you can compare what your DFU master send to the nRF52810.&nbsp;</p> <p><br />In appendix 5 of the tutorial I link to above, you can find the C code for SPI/UART DFU master that you can have a look.&nbsp;</p><div style="clear:both;"></div>