The serial number can be located on the bottom panel of the unit and in the GUI (Graphical User Interface) of the CM820.  This document includes the following sections:
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Locating the Serial Number on the Bottom Panel
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Locating the Serial Number in the GUI (Graphical User Interface)
Locating the Serial Number on the Bottom Panel
The serial number is located on the bottom white sticker of the device as S/N.Â
Locating the Serial Number in the GUI (Graphical User Interface)
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Launch a web browser, such as Internet Explorer, Firefox, or Safari. Enter http://192.168.100.1 into the address box, and press the Enter key. The Status page appears.
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Click the HW/FW Versions link on the top menu. The HW/FW Versions page appears. The serial number will be displayed (as shown below).