Do you know which modem you have? Verify that the Product Number (#) on the bottom of the modem listed below the serial number is 64-005686-07R and the product says Lite on the front label. If the code is 64-005686-06R and does not say Lite on the front go to the USR5686G support page.
Note: The modem DIP switches must be at factory default (3,5,8).
Firmware Version 1.0.3
Flash procedure for all Windows operating systems
Download the .zip file to a temporary location on your hard disk drive. Extract the .zip file to an empty directory on your hard drive. Double-click the .exe file, and follow the on-screen instructions.