https://devzone.nordicsemi.com/f/nordic-q-a/65043/custom-nrf5340---no-bluetoothWe have designed a custom board based on the NRF5340 with the following pinout. Everything flashes without error using the sample rpmsg image for the netcpu and the sample peripheral_ht for the appcpu but I cannot seem to get the bluetooth to work. Ien-USTelligent Community 13Tue, 25 Aug 2020 19:10:17 GMThttps://devzone.nordicsemi.com/thread/266323?ContentTypeID=1Tue, 25 Aug 2020 19:10:17 GMT137ad170-7792-4731-bb38-c0d22fbe4515:4cbf40a5-761a-4cb7-be7b-dfc4da19da3cwilldeng<p>This did the trick! Thank you so much for the help!&nbsp;</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/265768?ContentTypeID=1Fri, 21 Aug 2020 12:14:43 GMT137ad170-7792-4731-bb38-c0d22fbe4515:688219e3-ae95-4b92-9e7f-fa4d9ca34a03haakonsh<p>You need to change from using the external LFXO to the internal RC Oscillator.<br /><br /></p> <p>With menuconfig:</p> <p>Top -&gt; Device Drivers -&gt; Hardware clock controller support ---&gt; [*] NRF Clock controller support -&gt; 32 KHz clock source -&gt; (X) RC Oscillator<br />&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;-&gt; [*] Enable LF clock calibration<br />&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;-&gt; (X)32KHz Clock accuracy -&gt; 251 ppm to 500ppm<br /><br />Leave the calibration settings as they are.&nbsp;<br /><br />Do this for both application and hci_rpmsg.&nbsp;</p><div style="clear:both;"></div>