Multitech MultiModem ZBA MT9234ZBA-USB-CDC User Manual page 11

Chapter 2 – Installing the Modem
Click Next to continue the installation.
7.
A Windows Security window stating that the publisher cannot be verified might appear. If so, click Install this driver
8.
software anyway.
A transitory window opens as the installation completes.
9.
To finish installing, click Close.
10.
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MT9234ZBA-USB User Guide