Step1

Rubberized cover and battery removed.

To remove the battery push it a bit leftwards (upwards on the photo) and pull up the right edge. Then wiggle it a bit while pulling to disconnect the plug.

Remove eight marked screws. Then open the case. There are four latches on top, four on bottom and one on each side, below the page turn buttons. I found it easier to start opening from the top. See next photo for location of the latches.

Done