https://devzone.nordicsemi.com/f/nordic-q-a/55871/cannot-program-nrf52840-chipHello, I have an nRF52840 custom board, I&#39;m unable to connect with the board using J-Link EDU after programming once. Here is the connection diagram, I have used same connections on another board with nRF52832 chip. Here is the log file: Whaten-USTelligent Community 13Fri, 27 Dec 2019 09:11:08 GMThttps://devzone.nordicsemi.com/thread/226894?ContentTypeID=1Fri, 27 Dec 2019 09:11:08 GMT137ad170-7792-4731-bb38-c0d22fbe4515:cd6d7025-427f-4c4f-8d75-365176db7f9dHung Bui<p>Please take a photo of your setup. Please try to make the SWD cable as short as possible.&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/226593?ContentTypeID=1Fri, 20 Dec 2019 14:05:51 GMT137ad170-7792-4731-bb38-c0d22fbe4515:a3038382-6235-4241-8900-b05407723814Aftab<p>4000KHz, I have tried 100kHz as well with same result. I have removed the resistor and same result.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/226575?ContentTypeID=1Fri, 20 Dec 2019 13:31:02 GMT137ad170-7792-4731-bb38-c0d22fbe4515:1961b796-ecbe-4ad9-9d27-fbc8b52126e6Hung Bui<p>Hi,&nbsp;<br />Could you&nbsp;let me know why you have the pull down R15 register?&nbsp;<br />Which speed do you run the SWD interface ? Have you tried to run it with slower speed ?&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/226568?ContentTypeID=1Fri, 20 Dec 2019 13:08:20 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d6eac775-7104-4e1b-a1b9-e19a9e07754bAftab<p>However the issue popped up again which means that the issue may be something else. It&#39;s very confusing and annoying.</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/226537?ContentTypeID=1Fri, 20 Dec 2019 11:31:11 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d56aacf5-3f32-4033-a32e-dc468d51bdcfAftab<p>After all efforts, I re-soldered the 10 pin J-Link SWD connector and programming was successful.</p><div style="clear:both;"></div>