https://devzone.nordicsemi.com/f/nordic-q-a/80689/how-to-use-debug-output-on-nrf5340-dk-to-program-external-boardI am trying to program an external board using the development kid following the instructions HERE . I am using the debug out P20. I have tried supplying the board frm either USB and Li-ON by switching the position of the SW9. For both cases I haveen-USTelligent Community 13Wed, 20 Aug 2025 15:52:41 GMThttps://devzone.nordicsemi.com/thread/546240?ContentTypeID=1Wed, 20 Aug 2025 15:52:41 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d67f1a14-b19a-4e54-bc93-b51c4433a4f7umer<p>Hi there,<br /><br />I am facing the same issue. In 2.0.0 version of the nRF5340 dk, there is no GND_Detect pin on P20 interface.&nbsp;<br /><br />Kindly advise.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/334262?ContentTypeID=1Fri, 15 Oct 2021 06:52:34 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7ac68afc-1071-45d2-85a4-8aa3d19a4134ketiljo<p>The debugger is detecting the external target only if GND_detect is connected to ground. So if you connect this pin to ground, it should switch to the external board.&nbsp;<a href="https://devzone.nordicsemi.com/f/nordic-q-a/14058/external-programming-using-nrf52-dk">devzone.nordicsemi.com/.../external-programming-using-nrf52-dk</a></p> <p>Nut sure why you are connecting a USB cable to P20?</p><div style="clear:both;"></div>