If you're doing a hardware inventory, troubleshooting a driver compatibility issue, or preparing for a BIOS update, checking the current version is usually the first step.
Quick command:
Get-CimInstance -ClassName Win32_BIOS
Example output:
SMBIOSBIOSVersion : 1.26.1
Manufacturer : Dell Inc.
Name : 1.26.1
SerialNumber : ABC1234