Tell them that their device is not reporting its vendor and product to windows as evidenced by the string
Code:
\\\\?\\STORAGE#VOLUME#_??_USBSTOR#DISK&VEN_&PROD _&RE
For a properly working device, like your CyBook it would be some thing like
Code:
\\\\?\\STORAGE#VOLUME#_??_USBSTOR#DISK&VEN_BOOKEEN&PROD_CYBOOK&RE
you can see the difference by using the debug device detection button in calibre with each of the devices connected.