https://devzone.nordicsemi.com/f/nordic-q-a/46140/using-ulink2-with-nrf52840-and-keilI am trying to flash the blink example from SDK v15 into my custom nrf52840 board, I am using pc10056 example. I connected my ulink2 to swdio, swclck, gnd and vcc of my custom board and I can see on my debug settings but when I try to flash I get Invaliden-USTelligent Community 13Mon, 15 Apr 2019 12:15:40 GMThttps://devzone.nordicsemi.com/thread/182096?ContentTypeID=1Mon, 15 Apr 2019 12:15:40 GMT137ad170-7792-4731-bb38-c0d22fbe4515:6f54ff82-4373-4283-a851-62295cdd803dJ&#248;rgen Holmefjord<p>Hi,</p> <p>In general we do not support U-Link, and recommend using J-Link debugger that is provided on-board on our DK. The debugger on the DK can be used for flashing and debugging external board through <a href="https://infocenter.nordicsemi.com/topic/ug_nrf52840_dk/UG/nrf52840_DK/hw_debug_out.html?cp=3_0_4_7_9">&quot;debug out&quot; port</a>.</p> <p>Maybe <a href="https://devzone.nordicsemi.com/f/nordic-q-a/33891/programming-nrf52-softdevice-using-keil-ulink">this thread</a> is of any help for you?</p> <p>Best regards,<br />Jørgen</p><div style="clear:both;"></div>