USR5686G-PRO Courier® Lite 56K* Business Modem


Warranty: 2 Year

Spare Parts

Power Supply
Power Supply


  • Attaching a USR Modem to the Console Port of a Cisco Router
  • Configuring a Modem on a Cisco AUX Port
  • Configuring a Modem on a Cisco AUX Port for EXEC
  • Troubleshooting "no dial tone test" error message
  • Setting up Dial Security
  • V.34 & V.8 Explained
  • Serial Cable Pinouts

    Additional Support

    If the support information in this section doesn't help you solve your issue, you can contact a USR Help Desk Technician directly.

    Verify your product

    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.

    Manuals and other Documents

    Youtube Videos

    OS Compatibility




    2012 R2







    Vista 64


    XP 64




    98 SE

    98 FE






    Note: The modem DIP switches must be at factory default (3,5,8).
    Firmware Version 1.0.4
    Flash procedure for all Windows operating systems
    1. Download the .zip file to a temporary location on your hard disk drive.
    2. Extract the .zip file to an empty directory on your hard drive.
    3. Double-click the .exe file to run the Flash Loader application.
    4. Navigate to the new firmware file.
    5. Select and Open the firmware file that you want to install. The Flash Loader will search your computer's COM ports for the Courier Lite 56K Business Modem.

    Note: There must be no other active modems on any of your computer's COM ports.
    Once the Flash Loader selects the COM port, it will send the file to the modem. 369 KB 04/13/20
    Release Notes USR5686g-pro_v1.0.4-ReleaseNotes.txt 1 KB 04/13/20


    Installation for 32 and 64 bit Win 10, Windows 8, Windows 7, Server 2008, Server 2011, Server 2012, Server 2012 R2, Server 2016 and Server 2019

    The modem will install using the default driver provided by Windows.

    Installation file version - Windows 32 bit and 64 bit
    Note: Windows operating systems should automatically install the modem driver. If the driver does not install automatically, follow the instructions below:
    1. Download the file to a temporary location on your computer's hard disk drive.
    2. Double-click the file and follow the USRobotics Modem Installation Wizard to update modem driver.
    USR5686G-PRO-v6.01.00.5.exe1.1 MB 02/08/07

    Firmware Archive

    Firmware Version 1.0.3 370 KB 09/20/19
    Release Notes USR5686g-pro_v1.0.3-ReleaseNotes.txt 1 KB 09/23/19
    Firmware Version 1.0.1 369 KB 08/20/19
    Release Notes USR5686g-pro_v1.0.1-ReleaseNotes.txt 1 KB 08/20/19
    Firmware Version 1.0.0 369 KB 08/20/19

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    Electronic product documentation is provided as a courtesy to USRobotics customers. These are electronic versions of the original documentation. Some of the information contained within this documentation, including the support contact information, is subject to change.