Using a heat gun, heat the back of the device to loosen the adhesive securing the back cover.

Use a suction cup to lift the abck cover from the frame and insert a pick or plastic tool in between to pry the cover loose.

Work around the whole back cover to separate the back cover and frame.

If the adhesive is hard to remove, heat the area up again to loosen it.

The back cover is glass, so care is needed that it doesn't break.