Look for the line (not "Cast Version") to see your current number. How to Update Vizio TV Firmware
Most Vizio TVs update automatically when powered off and connected to the internet. However, if yours is stuck, you can force the process: Method 1: Automatic Over-the-Air (OTA) Update vizio firmware 4.25.11
If your TV refuses to find 4.25.11 or newer versions automatically, you can perform a manual install: Look for the line (not "Cast Version") to
It provides the foundation for core SmartCast functionalities and system stability before moving into the high-performance 4.500+ series. if yours is stuck