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…and tap the green button once
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“wrench” icon (highlighted in blue)
…and tap the green button
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…and tap the green button
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(on the RT84/MD-2017/DM-1701 it’s #8,
and on the MD-380/MD390, it’s #6)
…and tap the green button
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(the one that doesn’t have the blue dot)
…and tap the green button.
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Wait a few seconds and you’ll be returned back to the main screen:
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(That wasn’t so bad, now was it?)