After the first ring from the modem, press the key as noted below:
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B-Series, New G-Series and GV4 Version 2.x:
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Press Menu + 3 + 4 + 1 at the keypad.
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7000/9000 series, G-GV4 version 1.x: Press [CMD] + [43] at the keypad.
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D6412/D4412:
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Press [CMD] + [43] at the keypad.
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2000 Series Panels: Press 2+ Owner Code.
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D4112/D6112/D8112: Press [CMD] + [43] at the keypad.