Look at the lines in the debug output
DriveError: No removable drives found
The Windows WPD service says there are no portable devices connected
which indicate that windows is not seeing your device, or atleast, it is telling calibre that it not seeing the device. Make sure the device is showing up as multiple drives in windows explorer -- remeber that this device has a readonly partition that is useless -- the actual read/write partition has to be detected.
Try a different usb cable/port, or you can use the connect to folder function in calibre to connect to a folder on the device.
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