https://devzone.nordicsemi.com/f/nordic-q-a/32828/how-to-debug-nrf52840-pdkHi, I&#39;m new to the nRF52840 PDK and using it for some evaluation purpose for a specific product. Would you mind telling me how to debug the board? Is it just plug in the USB cable(J2) and turn on the power switch? It showed the error msg as belowen-USTelligent Community 13Wed, 28 Mar 2018 13:21:33 GMThttps://devzone.nordicsemi.com/thread/126324?ContentTypeID=1Wed, 28 Mar 2018 13:21:33 GMT137ad170-7792-4731-bb38-c0d22fbe4515:76b8a13d-e077-4f17-b8d3-0620367d82ddBK<p>OK, finally fix it, it&#39;s the problem of the driver, thanks a lot!</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/126308?ContentTypeID=1Wed, 28 Mar 2018 11:14:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:0a38a8e4-ce27-48c2-a81e-c7fceb48fd5eHung Bui<p>Hi,&nbsp;</p> <p><br />When you plug the DK in do you see there is a new hard driver opened on your computer ?&nbsp;</p> <p>Have you made sure the SW6 switch is switched to DEFAULT and SW9 switch is switched to VDD ?&nbsp;</p> <p>&nbsp;</p> <p>I assume you installed Jlink Driver on your computer.&nbsp;</p><div style="clear:both;"></div>