Using a Torx, T-6 star-bit screwdriver unscrew four 7.38 mm screws from battery housing.
Unscrew four 7.15 mm screws from back casing.
Using the blue plastic opener tool along the seam of the case, pry off the back casing from the front casing.
Start prying from the bottom of the calculator, as the case hooks into the top.
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