Error messages

What should I do if I get the error message: "No video doorphone has been detected"?
What should I do if I get the error message, "No internet connection"?
What to do if I get the error message: "This Wi-Fi network was not found"?
What should I do if I get the error message, "Update failed"?
What should I do if I get the message: "Your connected video doorphone is already installed at another location"?

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