Fujitsu STYLISTIC Q509 Operating Manual page 60

Accessories for your Tablet PC (optional)
Hold the tablet and TPU cover vertically and press the upper left side of the TPU cover (3)
and move the upper right side of the tablet (4) in the direction of the arrow.
Once the TPU cover is removed, the tether can be un-attached from the tablet. Slide
the tether out of the TPU cover hole and re-attach it to the tablet.
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