As per Microsoft's USB debug page, you must launch WinDbg in an elevated process in order to install the USB driver.

Having done that, I still receive this error message:

Failed to copy USB device driver inf. The debugger must be run elevated for the first use of this transport. Error 0xE0000247.


You may have an unsigned USB debug driver eg: from preview build of WinDbg / driver tools for Windows SDK.

The error message is no doubt a catch all for "failed to install inf" for any reason. Not informative for those with non permission related failures (you correctly ran Windbg as Admin)

Solution: Reboot with "Disable Driver Signing Enforcement" eg: https://windowsreport.com/driver-signature-enforcement-windows-10/

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