https://devzone.nordicsemi.com/f/nordic-q-a/67052/not-able-to-program-bmd-350-a-r-by-using-swd-pins-of-nrf52dkHi! I have BMD-350 -A-R and I want to program this by using SWD pins (SWCLK, SWDIO, GND Detect, and VTG) of Nrf52Dk . I make all the connections properly but for some reason, I am not able to program the external chip and no error appears. Wheneveren-USTelligent Community 13Tue, 13 Oct 2020 11:50:24 GMThttps://devzone.nordicsemi.com/thread/274604?ContentTypeID=1Tue, 13 Oct 2020 11:50:24 GMT137ad170-7792-4731-bb38-c0d22fbe4515:d27bb479-b731-4d9e-adb1-12f66bdac6e6Jared<p>Hi,</p> <p>Have you remembered to either add the necessary low frequency external clock source or switched the LFCLK clock source in your project to the RC oscillator or the synthesized one?&nbsp;</p> <p>regards</p> <p>Jared&nbsp;</p><div style="clear:both;"></div>