https://devzone.nordicsemi.com/f/nordic-q-a/80752/custom-board-doesn-t-do-dfuHey, I have a custom board that is pretty much the same as an evaluation board I got. I use the secure_bootloader_uart_mbr_pca10056 to enter and execute a DFU. On the evaluation board it works great but on the custom board I get no response to theen-USTelligent Community 13Tue, 19 Oct 2021 07:14:52 GMThttps://devzone.nordicsemi.com/thread/334741?ContentTypeID=1Tue, 19 Oct 2021 07:14:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:ba4e7c55-bd2c-4b87-b9d1-68f5c9d0eed3RobbLev<p>Thank you for the reply, I was wrong in my analysis, the board does send the response but the host didn&#39;t receive it.</p> <p>This clearly made me check the uart config and I found the problem was the uart flow control.</p> <p>by changing NRF_DFU_SERIAL_UART_USES_HWFC from 1 to 0 the issue was fixed :)</p> <p></p> <p>I must say I love the quick and professional responses I always get on this forum and just want to say again that I highly appreciate it.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/334480?ContentTypeID=1Mon, 18 Oct 2021 07:03:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:22140252-c3d8-4c5e-9643-38d9fc03dfa3Einar Thorsrud<p>Hi&nbsp;<span>Robbie,</span></p> <p><span>I am not sure what causes&nbsp;this. It would&nbsp;be good with a few more details:</span></p> <ul> <li><span>In what way does your custom board differ from the DK?</span></li> <li><span>Can you test with a&nbsp;secure_bootloader_uart_mbr_pca10056<strong>_debug</strong> project instead and upload the RTT log here?</span></li> <li><span>Which SDK version do you use?</span></li> <li><span>Which changes has you done to the bootloader (both changes to adapt to your HW and other changed)?</span></li> </ul><div style="clear:both;"></div>