https://devzone.nordicsemi.com/f/nordic-q-a/111207/j-link-commander-to-nrf52840-dk-chip-rak4631-boardI am sorry that I post my question on this forum because I cannot find a button to post. I also use a J-LINK EDU mini to flash the RAK4631 board. During J-Link Commander, I cannot open file &quot;C:\demo\seggerdemo.bin 0x0&quot; as the video instruction. wwwen-USTelligent Community 13Wed, 15 May 2024 12:04:45 GMThttps://devzone.nordicsemi.com/thread/483495?ContentTypeID=1Wed, 15 May 2024 12:04:45 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1b9b128a-40f0-47cf-9cf0-317f6d9a055cVidar Berg<p>Ok, that explains why the command is failing. To get started with development, I recommend you start with the &#39;nRF Connect SDK Fundamentals&#39; course at&nbsp;<a id="" href="https://academy.nordicsemi.com/courses/nrf-connect-sdk-fundamentals/">https://academy.nordicsemi.com/courses/nrf-connect-sdk-fundamentals/</a>.&nbsp;&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/483493?ContentTypeID=1Wed, 15 May 2024 12:01:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6108a05f-e9c0-40fc-b599-064c5cfc1be8Tan Ho<p>No, I do not. From this step, what should I do? or which file should I load?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/483487?ContentTypeID=1Wed, 15 May 2024 11:54:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:edbc0ffd-a03d-47e7-8ea7-ff4f5eadf208Vidar Berg<p>Hi,</p> [quote userid="133678" url="~/f/nordic-q-a/111207/j-link-commander-to-nrf52840-dk-chip-rak4631-board"]C:\demo\seggerdemo.bin[/quote] <p>Do you have a directory named &#39;demo&#39; with this file on your c drive?</p><div style="clear:both;"></div>