https://devzone.nordicsemi.com/f/nordic-q-a/127721/flashing-nrf-5340-custom-board-with-nrf52dk-v1-2-4Hello! I am having troubles with my custom board using BL5340 from Ezurio. I have tried to flash it via my nrf5340 Audio DK but realized it doesnt support external Flashing. Then i got my Hands on a nRF52dk v1.2.4 which has the option to use the J-Linken-USTelligent Community 13Wed, 08 Apr 2026 12:34:38 GMThttps://devzone.nordicsemi.com/thread/564624?ContentTypeID=1Wed, 08 Apr 2026 12:34:38 GMT137ad170-7792-4731-bb38-c0d22fbe4515:aa7fb9b7-abeb-44b4-8b6b-40628c40ad64Einar Thorsrud<p>Hi,</p> <p>The onboard debugger on the older nRF52 DKs cannot program nRF5340, regardless of voltage. (A nRF52 DK version 3.0 or higher should be able to though, but you still have the problem with votlage. An alternative here could be to use an RF54L15 DK, which also has configurable voltage. But note that the DKs are not ment for production programming).</p> <p>Regarding <a href="https://www.segger.com/products/debug-probes/j-link/models/j-link-edu-mini/">J-Link EDU Mini</a> that should support support it, and also with regards to the voltage. But there are&nbsp;license&nbsp;limitations when it comes to using&nbsp;that commercially, so if that is the case, you should consider another. I recommend contacting Segger about this.</p><div style="clear:both;"></div>