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steps to reset Casio fx-991ES calculator-
1. Turn the calculator on with the ON button. There is no hardware reset button on the back.
2. Press SHIFT then 9 to enter Reset. A list of items which can be reset are shown.
3. 3 to select the Reset All option.
4. Press = to confirm the reset. The calculator has been reset at this point.
5. Press AC to return to normal calculation, or SHIFT AC to turn the calculator off.