Ok, I have solved this issue using instruction here,   I shutdown the XPS 8930, unplugged the power cord for a few minutes, then powered it back on. I then went to Device Manager and uninstalled the Unknown USB Device (Device Descriptor Request Failed). When I then did a Scan for Hardware Changes, the Bluetooth appeared in Device Manager. This resolved the issue.
Received product 3 days ago and everything looked fine. Then Bluetooth suddenly stopped working. Tried reinstall driver provided on Dell website, and every step provided by Microsoft troubleshooting page. Still no good. Bluetooth device is: Qualcomm QCA9377 Has anyone seen a similar issue?
Aurora R10, bluetooth stopped working