WIRELESS AIO 966 PRINTER AND NEW CONEXION AT&T U-VERSE

4 days ago AT&T technician came to my house to my house to change the conexion from DSL to U-VERSE.  Wrong decision! when the technician finish installing the new modem-router (white box) I have internet BUT no printer. I uninstalled and tried to install again the printer with no luck. I called the people from Conectech from AT&T and they said that apparently the printer doesn't like the Hi-Fi conexion protocol WPA.

Can anybody help me with this problem?

Thank you!

Carmen