https://devzone.nordicsemi.com/f/nordic-q-a/71420/programming-nrf52-dk-board-using-external-j-linkHi, I have two nRF52 DK boards which i bought one is 2 years old and another 1 year old.. Past week both DK boards are failed to connect with the computers but the power supply is going and the nrf52832 controller works fine. the LED5 &quot;segger j-linken-USTelligent Community 13Mon, 08 Feb 2021 15:04:52 GMThttps://devzone.nordicsemi.com/thread/293378?ContentTypeID=1Mon, 08 Feb 2021 15:04:52 GMT137ad170-7792-4731-bb38-c0d22fbe4515:b622389d-a138-4216-84d8-e08b85da8baaSunil vignesh<p>Hi <a href="https://devzone.nordicsemi.com/members/kenneth">Kenneth</a>,</p> <p>1. Is it possible to overwrite the interface MC sing external j-link ? Is there any video link or documentation please provide</p> <p>2. I found that P18 &quot;<strong>DEBIG IN </strong>&quot; headers are direct programming pins of nrf controller.</p> <p>DID i connect external j-link directly to that pin and I will se it or i need to cut off &quot;<strong>SB27,SB26,SB20,SB21,SB22,SB23,SB24,SB25</strong>&quot;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/293346?ContentTypeID=1Mon, 08 Feb 2021 13:31:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:38deaeeb-0f38-46c0-949a-80912b53795bKenneth<p>Hi,</p> <p>You should find description in the nRF52-DK user guide:<br /><a href="https://infocenter.nordicsemi.com/topic/ug_nrf52832_dk/UG/nrf52_DK/hw_debug_out.html">https://infocenter.nordicsemi.com/topic/ug_nrf52832_dk/UG/nrf52_DK/hw_debug_out.html</a>&nbsp;<br /><a href="https://infocenter.nordicsemi.com/topic/ug_nrf52832_dk/UG/nrf52_DK/int_mcu_firmw.html">https://infocenter.nordicsemi.com/topic/ug_nrf52832_dk/UG/nrf52_DK/int_mcu_firmw.html</a></p> <p>Kenneth</p><div style="clear:both;"></div>