https://devzone.nordicsemi.com/f/nordic-q-a/105743/nrf52840-dk-debugger-hw-ver-3-0-1-2023-6-not-workingHello, We have an issue with the nRF52840 DK 3.0.1 2023.6 as a debugger. we are using this kit to update an external target from same type. but this is not working. we have similar board but with older revision 2.0.1 2020.46 and we are using iten-USTelligent Community 13Thu, 16 Nov 2023 14:42:30 GMThttps://devzone.nordicsemi.com/thread/456013?ContentTypeID=1Thu, 16 Nov 2023 14:42:30 GMT137ad170-7792-4731-bb38-c0d22fbe4515:77e342e0-3abc-4922-99f6-05035ebe7691Kazi Afroza Sultana<p>Hello,</p> <p>Does the voltage of the external board match the VDD of the nRF52840 DK? Normally,&nbsp;<span>this is 3 V when running from USB, but if the onboard&nbsp;</span><span>nRF52840</span><span>&nbsp;</span><span>SoC is supplied from either USB or Li-Ion, the nRF power source switch (</span><span>SW9</span><span>) is in either Li-Po or USB position, and VDD can be set by the&nbsp;</span><span>nRF52840</span><span>&nbsp;firmware.</span></p> <p><span>Can you try to erase (nrfjprog -e) and recover (nrfjprog -r) the board using nrfjprog ?</span></p> <p><span>Thanks.</span></p> <p><span>BR</span></p> <p><span>Kazi</span></p><div style="clear:both;"></div>