https://devzone.nordicsemi.com/f/nordic-q-a/73096/programing-custom-pcb-board-through-nrf52-dkHi. I am going to make my own PCB with nrf52832. Before making it, I have to check debugging through P20 in nrf52832 DK. I have two nrf52832 DKs with SDK17.0.0. I will call first nrf52832 No1, and the other No2 for understanding. So, I connecteden-USTelligent Community 13Thu, 25 Mar 2021 13:03:54 GMThttps://devzone.nordicsemi.com/thread/301906?ContentTypeID=1Thu, 25 Mar 2021 13:03:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:97732a23-0419-4e5b-b7b1-3b1fe79f1ebeEinar Thorsrud<p>I do not immediately see the issue. Can you compare with the diagram in <a href="https://devzone.nordicsemi.com/f/nordic-q-a/14058/external-programming-using-nrf52-dk/53757#53757">this post</a>?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/301881?ContentTypeID=1Thu, 25 Mar 2021 11:51:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4d7c15e3-5f19-409a-82cd-07bf6e0902b2ENENER<p>Hi</p> <p></p> <p>I connected GND Detect to external DK&#39;s ground.</p> <p>But still onboard debugger is debugged in nRF Connect and Segger Embedded Studio.</p> <p></p> <p>Do you know what&#39;s problem?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/301505?ContentTypeID=1Tue, 23 Mar 2021 15:34:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:5afbbc4e-29f9-42ca-ba1f-0572478fe3c3Einar Thorsrud<p>Hi,</p> <p>From the photo it looks like you have not connected GND DETECT to ground. Then, the onboard debugger will debug the onboard nRF and not the external one.</p><div style="clear:both;"></div>