https://devzone.nordicsemi.com/f/nordic-q-a/92022/custom-board-failing-debug-sessionHi, I am using a Raytac MDBT50Q module on a custom board of mine. I have no 32kHz installed (which is available inside the module), VDD and VDDH are common and powering up from 3V. I cant start a debug session. There are no errors thrown. The followingen-USTelligent Community 13Tue, 20 Sep 2022 03:25:54 GMThttps://devzone.nordicsemi.com/thread/386978?ContentTypeID=1Tue, 20 Sep 2022 03:25:54 GMT137ad170-7792-4731-bb38-c0d22fbe4515:02aafde4-d3d3-4b88-a660-d7f681c56f8ckaushalyasat<p>Hi Sigurd,</p> <p>Many thanks. Yes the missing of the 32kHz crystal was the issue. I misread the datasheet of the Raytac module. They don&#39;t have 32kHz crystal inside, just the 32MHz crystal.</p> <p>I didn&#39;t try the internal RC oscillator approach as you have mentioned here. But I think it would have solved the problem as well.</p> <p>Cheers,</p> <p>Kaushalya</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/386865?ContentTypeID=1Mon, 19 Sep 2022 12:26:00 GMT137ad170-7792-4731-bb38-c0d22fbe4515:3b3cd5f4-1106-4142-98b5-4f670b351bd4Sigurd<p>Hi,</p> [quote user=""] I have no 32kHz installed[/quote] <p>Try setting&nbsp;</p> <div>CONFIG_CLOCK_CONTROL_NRF_K32SRC_RC=y</div> <div></div> <div>in your prj.conf file, or add it to your &lt;board_name&gt;_defconfig file</div><div style="clear:both;"></div>