https://devzone.nordicsemi.com/f/nordic-q-a/90117/is-the-nrf5340-dk-j-link-firmware-available-to-downloadHi, I have a nRF5340-DK with a ATSAM3U2CA interface MCU as an on-board debugger. For the nRF52840-DK, the interface MCU firmware is available to download: https://www.nordicsemi.com/Products/Development-hardware/nRF52840-DK/Download?lang=en#infotabsen-USTelligent Community 13Wed, 20 Jul 2022 00:19:24 GMThttps://devzone.nordicsemi.com/thread/377738?ContentTypeID=1Wed, 20 Jul 2022 00:19:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d585ea06-4620-4ba5-b81a-2a7dfb6cecc9Karl Ylvisaker<p>Hello again,<br /><br />I was just informed that we will not distribute this binary, since there is no need nor possibility for you to update the firmware on the debugger nRF5340 SoC, as opposed to how it was with the older non-nRF5340 debugger SoCs.<br /><br />Best regards,<br />Karl</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/377507?ContentTypeID=1Tue, 19 Jul 2022 06:10:09 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e2e64270-57e1-42e1-9215-0482a1a71e25Karl Ylvisaker<p>Hello,<br /><br />I see what you mean. I&#39;ll check with the DK engineering team and see what they say about it - I&#39;ll be back with any updates! :)<br /><br />Best regards,<br />Karl</p><div style="clear:both;"></div>