Re: XPS 8930, creating a USB recovery drive on a separate PC
I believe one option is to use Microsoft's Media Creation Tool and create a bootable USB drive with your version of Windows 10. I would make sure you use the version of Windows 10 (1709, 1803, 1809) that is on the computer you are repairing. Then booting the USB drive, instead of installing Windows, you would select the Repair option. The Media Creation Tool can be used to create the bootable USB drive on any computer.