Error 651 – Connection Modem Sierra 881U (The Solution)

“Error 651: The modem (or other connecting device) has reported an error”. Problem Connection of Modem Sierra 881U. Was surprised by that response. That’s how it appeared when I will start an internet connection using a AirCard Modem Sierra 881U. I have tried Uninstalling the Modem Driver, Restart the computer and reinstall but the result…