Cannot flash custom board after upgrading to SDK 3.4 from 3.1.1 using nrfutilhttps://devzone.nordicsemi.com/f/nordic-q-a/129102/cannot-flash-custom-board-after-upgrading-to-sdk-3-4-from-3-1-1-using-nrfutilHello! Sought out to upgrade from NRF SDK 3.1.1 to 3.4.0 today so downloaded and installed it on Mac using nrfutil sdk-manager command line, and that was fine. The project I was working on still using 3.1.1, so in the meantime I needed to flash a customen-USTelligent Community 13Fri, 04 Sep 2026 09:04:37 GMTRE: Cannot flash custom board after upgrading to SDK 3.4 from 3.1.1 using nrfutilhttps://devzone.nordicsemi.com/thread/570918?ContentTypeID=1Fri, 04 Sep 2026 09:04:37 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e8a071eb-9f51-4a1e-9c01-84714f1216f9Kazi Afroza Sultana<p>Hello Matthew,</p> <p>After reading your post, the first thing came to my mind was to check if nrfutil has the updated version installed for NCS V3.4.0.</p> <p>Can you please try to run this command on the command line?</p> <p><pre class="ui-code" data-mode="text">nrfutil install device --force</pre></p> <p>BR<br />Kazi</p><div style="clear:both;"></div>RE: Cannot flash custom board after upgrading to SDK 3.4 from 3.1.1 using nrfutilhttps://devzone.nordicsemi.com/thread/570909?ContentTypeID=1Fri, 04 Sep 2026 04:31:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a0ff019c-7aec-4cb2-9837-01665d9978e8MR93<p>After nearly 5 hours debugging this, by chance I went into J-Link Config app on Mac, right-clicked &quot;Configure&quot; on the debugger, happened to exit out using the &quot;Ok&quot; button and it seemed to have just reset the config. Finally. This should be easier though... That was pure chance. Understand this is likely a Segger problem.<br /><br />Hopefully this helps someone else out.</p><div style="clear:both;"></div>