https://devzone.nordicsemi.com/f/nordic-q-a/66139/download-program-is-ok-but-the-mobile-phone-couldn-t-find-itHi, I would like to ask, if I just want to &quot;Download program&quot;, what components on the schematic diagram are needed? Download program is OK, so first make sure that the &quot;a&quot; part of the components are normal, and then try to replace the remainingen-USTelligent Community 13Mon, 21 Sep 2020 11:17:21 GMThttps://devzone.nordicsemi.com/thread/270555?ContentTypeID=1Mon, 21 Sep 2020 11:17:21 GMT137ad170-7792-4731-bb38-c0d22fbe4515:7d73b108-7358-4d13-9605-2fd9b2438b0fJONATHAN LL<p>Hi tony,<br /><br /><img src="https://devzone.nordicsemi.com/resized-image/__size/320x240/__key/support-attachments/beef5d1b77644c448dabff31668f3a47-7a8e8048a16f473da61059c45fee7001/pastedimage1600686755063v1.png" alt=" " /><br /><a href="https://infocenter.nordicsemi.com/topic/ps_nrf52811/ref_circuitry.html?cp=4_4_0_6_2_2#unique_213461923">This schematic</a> of the LDO layout with out the optional 32KHz crystal.<br />You can also remove the N.C (not Connected) component C6.<br /><br />Are you talking about a custom PCB that you have designed?<br /><br />You are able to Flash the program to the PCB but you are not able to detect the device over BLE?<br /><br />Could you share your GERBER or PCB layout files if that is the case?<br /><br />Regards,<br />Jonathan</p><div style="clear:both;"></div>