How to Repair the FlexVSP Virtual Serial Port Driver

Fixing SmartSDR CAT Virtual COM Port Issues (FlexVSP Repair)

In some cases — most often after a Windows update — the virtual serial port driver used by SmartSDR CAT may stop working.  When this happens, SmartSDR CAT may not create or recognize COM ports.

Performing a FlexVSP repair usually resolves the issue.

Step-by-Step Repair Instructions

1. Close all FlexRadio programs
   • Exit SmartSDR CAT
   • Close SmartSDR and any other FlexRadio applications
2. Open File Explorer
   • Press Windows Key + E or open File Explorer
3. Go to the FlexVSP folder

   • Navigate to:

     C:\Program Files\FlexRadio Systems\FlexVSP

4. Find the FlexVSP installer

   • Look for a file named:

     FlexVSPInstaller_xx.msi

     (“xx” will be 32 or 64, depending on your version of Windows)

5. Run the repair
   • Right-click the installer file
   • Select Repair
   • Click Yes if Windows asks for permission
6. Wait for the repair to finish
   • This may take a minute or two
7. Restart your computer
   • When prompted, choose Yes and allow Windows to reboot

After Restarting

Once your computer has restarted:

• Launch SmartSDR
• Start SmartSDR CAT
• Confirm that your virtual COM ports are now present and working

If the FlexVSP installer file is not found, or if the problem continues after completing these steps, please contact FlexRadio Support for further assistance.