The USB cable is attached to the white plastic outer body by means of a plastic fixture that is help in place with a large metal c-clip.

The plastic fixture is covered in hot glue that must be scraped off.

Once the hot glue is removed, the c-clips can be slipped off.

With the c-clip removed, the plastic fixture can be pulled back out of the outer body. The 4 USB cable wires and connector can then be slipped out through the outer body opening.