https://devzone.nordicsemi.com/f/nordic-q-a/127214/nrf52840-custom-board-failed-to-download-ramcodeHello, I am a junior developer currently working with the nRF52840. I have been developing and debugging successfully using the nRF52840 Evaluation Kit (DK) without any issues. However, I am now facing significant problems while trying to flash theen-USTelligent Community 13Mon, 02 Mar 2026 09:02:27 GMThttps://devzone.nordicsemi.com/thread/562285?ContentTypeID=1Mon, 02 Mar 2026 09:02:27 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1d68f3a6-0d34-416c-9f84-cb8846b0d15bSusheel Nuguru<p>Hi Junseo,</p> <p>Have you verified if your power source is stable and checked that VDD is at the right level? typical value that you should read is around 3V to 3.3V<br /><strong></strong></p> <p>If your custom board does not have the required DCDC inductor, but the firmware enables DCDC, the board will not run. Disable it with:&nbsp;<strong><em><span>CONFIG_BOARD_ENABLE_DCDC</span><span>=</span>n</em></strong></p> <p><em></em>Nothing else pops to my mind as of now. But those above two has been most common pitfalls. Since --recover also fails, I think we can rule out APPROTECT issues for now.</p><div style="clear:both;"></div>