UBR VALUE refers to the Update Build Revision (UBR) number in Microsoft Windows operating systems, particularly Windows 10 and Windows 11.
This is a unique numerical identifier that tracks the exact level of cumulative updates, security patches, and revisions applied to the OS build. It helps IT administrators verify if devices are fully patched without relying solely on the main build number (e.g., 19045.xxx), as the UBR increments with each update release.
Key Details:
• Purpose: The UBR ensures precise update tracking. For example, two systems might share the same base build (like 10.0.19045) but differ in UBR (e.g., 3636 vs. 4291), indicating different patch levels.
• Location: It’s stored in the Windows Registry at HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\UBR.
• How to Check It:
• Via Command Prompt or PowerShell: Run ver for a quick overview, or use PowerShell:
(Get-ItemProperty "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion").UBR
This outputs the current UBR value (e.g., 4291).
• Via System Info: Use systeminfo | findstr /C:"OS Version" in Command Prompt for related details, though it may not always show the full UBR.
• Example: As of recent updates (e.g., KB5036892), the UBR might be 4291 for Windows 11 build 10.0.19045.
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