How to see hidden files/folders on android internal storage over USB
One option may be to go in with ADB this can usually see the file system without much of an issue. So you can look into how to hook it up to your phone (the link above will get you started), and once you are connected copy the files over command line.

Another possibly easier option would be to put a file explorer app on your phone and and transfer the files locally to another visible location on your phones file system.

EDIT:

This may be a bit of a weird one, but if you put this code: *#*#273283*255*663282*#*#*

into your dialer, it should give a file copy screen which may give you the desired result.

The code is from this post.