https://devzone.nordicsemi.com/f/nordic-q-a/104673/nrf9160-dk-debug-in-port-cannot-attach-to-nrf52-or-nrf91Hi there, I am trying to attach an external JLink debugger to both the nRF91 and nRF52 MCUs on the nRF9160-DK. I would like to do this so that I can debug both MCU&#39;s simultaneously, as I am limited to one MCU at a time using the onboard debugger. Ien-USTelligent Community 13Fri, 13 Oct 2023 09:22:58 GMThttps://devzone.nordicsemi.com/thread/450248?ContentTypeID=1Fri, 13 Oct 2023 09:22:58 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e6b3e616-547b-4cf7-a938-c15cad2ad3d5FARLY7<p>Please delete/close this issue.</p> <p>It seems I just needed to reverse the ribbon cable on the JLink side, which is the opposite of its usual position. Perhaps I am using a different cable this time.</p><div style="clear:both;"></div>