https://devzone.nordicsemi.com/f/nordic-q-a/109163/nrf52840-stuck-after-programmingHello everyone, I&#39;m currently prototyping a custom board with nrf52840, here the schematics: I use the config 3 of the reference schematics. I misunderstood the PSELRESET register, believing I can change the gpio which have the nReset functionen-USTelligent Community 13Tue, 12 Mar 2024 18:08:53 GMThttps://devzone.nordicsemi.com/thread/473514?ContentTypeID=1Tue, 12 Mar 2024 18:08:53 GMT137ad170-7792-4731-bb38-c0d22fbe4515:9f0e46fd-a69b-488f-94b7-f1c2eba3e718Kenneth<p>Hello,</p> <p>The following information should ONLY be used to get the board up and running again, and not in a product. It&#39;s very important that you don&#39;t exceed the voltages mentioned, since this will very likely DAMAGE the device:</p> <p>You can directly power Dec4 with 1.3V. When you have wrong setting for DCDC, then the failing DCDC regulator fails to output 1.3V to DEC4 which is the main supply to the nRF chip. If you supply 1.3V directly to DEC4 then it should bring the chip out of reset mode and you can reflash the firmware with DCDC disabled.&nbsp;</p> <p>It&#39;s possible to connect the reset pin directly to VDD if you have by accident enabled it and driven it low internally or externally. This&nbsp;<span>should bring the chip out of reset mode and you can reflash the firmware with pin reset disabled.&nbsp;</span></p> <p>Kenneth</p><div style="clear:both;"></div>