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The password is a 4-digit numeric code. One digit is active at a time; the
remaining three are masked with * characters.
Press the green button to increment the active digit. Press the red button to
decrement the active digit.
Press and hold the green button to activate the next digit (to the right). Press
and hold the red button to activate the previous digit (to the left).
Press and hold the green button and the red button at the same time to submit
the new password.