Use the plastic opening tool with a prying motion, going between the case and the LCD, from the middle of the LCD to the right of the device, undoing the claws retaining the back.

When replacing the back cover of the device, ensure the flash module is UP.

The back cover should come off easily but you might hear light snapping or popping.

The rotary wheel and button are not secured. They will come loose when the back cover is removed. Set them aside for reassembly