This requires erasing all the memory in the machine; follow the steps below.
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Power off the machine.
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Hold down the "Shift" and the "R" keys.
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While holding down the "Shift" and the "R" keys, press the "On/Off" key once and then release the "Shift" and the "R" keys.
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"English" should be on the display, press the "Enter" key. If "English" did not display, repeat steps 1 thru 3.
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"inch" will be on the display, press the "Enter" key.