BenQ Z2 - Manual (Page 22)

6 Preparing Your Phone For Use
Removing the Front Cover
Press down the groove at the bottom of the phone, then lift the cover off
the phone.
Placing the Front Cover
Align the tabs on the inside top edge of the front cover with the holes on
the top edge of the phone. Then place the front cover onto the phone
until the latch catches the cover.
Groove
Front cover
latch