https://devzone.nordicsemi.com/f/nordic-q-a/40675/keep-usb-sdfu-port-number-all-are-same-for-each-deviceHi Sir We&#39;d want to make lot of nrf52840 devices, and all devices included open bootloader program, however, the each device USB SDFU port number are different (COM30, 31, 32 ...) when I plug-in usb cable to PC. it&#39;s not good for production, pleaseen-USTelligent Community 13Fri, 23 Nov 2018 12:35:19 GMThttps://devzone.nordicsemi.com/thread/158829?ContentTypeID=1Fri, 23 Nov 2018 12:35:19 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e672966f-6030-4501-a653-afe5171090eaAndreasF<p>Hi.</p> <p>It&#39;s not up to Nordic to maintain the same COM Port number, this is something Windows does, and we cannot control it.</p> <p>- Andreas</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/158759?ContentTypeID=1Fri, 23 Nov 2018 08:03:05 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e9755e54-0c95-40f5-a9a1-f99be8b4baa5Justin_Yeh<p>Maybe maintain a constant serial number, then Windows does not change the COM port ?</p><div style="clear:both;"></div>https://devzone.nordicsemi.com/thread/158175?ContentTypeID=1Tue, 20 Nov 2018 12:56:42 GMT137ad170-7792-4731-bb38-c0d22fbe4515:e5cc2fb2-cc98-4b0e-bb43-e61f5508029aAndreasF<p>Hi.</p> <p>This is unfortunately a Windows issue, as this is the way Windows handles COM ports, there is not much we can do about it.</p> <p>- Andreas</p><div style="clear:both;"></div>