https://devzone.nordicsemi.com/f/nordic-q-a/46373/hi-i-need-you-helpPlease understand that it is English using a machine. Hello. I try to create a module using nrf52810 and nrf52840. We are testing &quot;secure_uart_pca10040_s112&quot;, an example included in sdk. You can upload to nRF 54 openen-USTelligent Community 13Tue, 23 Apr 2019 13:38:29 GMThttps://devzone.nordicsemi.com/thread/183145?ContentTypeID=1Tue, 23 Apr 2019 13:38:29 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9aa9fe33-9d71-400d-9d7f-96851edea5a2Einar Thorsrud<p>Hi,</p> <p>Is it the case that you are using the&nbsp;secure_uart_pca10040_s112 project and want to do DFU from an iPhone? If so that won&#39;t work, as the&nbsp;secure_uart_pca10040_s112 use UART transport layer (wired UART), which is probably not what you want.&nbsp;You need to pick a BLE bootloader project, for instance &lt;SDK&gt;\examples\dfu\secure_bootloader\pca10056_ble for the nRF52840. I also recommend you read <a href="https://devzone.nordicsemi.com/b/blog/posts/getting-started-with-nordics-secure-dfu-bootloader">Getting started with Nordic&#39;s Secure DFU bootloader, a step by step guide</a>.</p><div style="clear:both;"></div>