Microsoft has released the Windows 11 August 2025 Cumulative Updates, KB5063878 for version 24H2 and KB5063875 for versions 22H2 and 23H2, delivering critical stability fixes and new features released along with Microsoft patch Tuesday august 2025.
These updates address performance issues reported since May 2025, including frame rate drops in games like Fortnite and device unresponsiveness, caused by a bug in prior patches now resolved.
Installation Options
Available through Windows Update for automatic installation, both updates can also be downloaded manually from the Microsoft Update Catalog for users facing issues. The large file sizes reflect embedded AI models, even for non-NPU systems.
KB5063878 (24H2) Download Sizes:
- ARM64: 3509.1 MB, Build 26100.4946
- x64: 3054.9 MB, Build 26100.4946
- x64 (Server 24H2): 3054.9 MB, Build 26100.4946
KB5063875 (22H2/23H2) Download Sizes:
- ARM64: 1030.5 MB, Builds 22621.5768 and 22631.5768
- x64: 896.7 MB, Builds 22621.5768 and 22631.5768
What’s New in KB5063878 (Windows 11 24H2, Build 26100.4946)
AI-Powered Settings
The Settings app now features a top-centered search bar. On Copilot+ PCs with 40+ TOPs, it acts as an AI assistant, suggesting relevant settings (e.g., Battery options for power-saving queries). This feature is limited to Copilot+ PCs and requires English as the primary display language.
Handheld Gaming Support
Enhanced controller navigation in the touch keyboard’s Gamepad layout includes shortcuts for PIN entry and menu selection, paving the way for a gaming-optimized Windows 11 for handheld devices.
Black Screen of Death
The Blue Screen of Death (BSOD) is now a minimalist Black Screen of Death, aligning with Windows 11’s modern design. While it generates error logs faster, its similarity to the update installation screen may confuse users.
Quick Machine Recovery
This feature, inspired by the CrowdStrike outage, allows data-preserving recovery from corrupted Windows installations, even in BSOD loops, via the Windows Recovery Environment (WinRE). It’s enabled by default for home users and configurable via Intune for IT admins.
Other Enhancements
- Recall in EEA: Includes snapshot export for third-party apps with a unique code.
- Reading Coach: Adds a “Click to Do” feature for reading fluency via the Microsoft Reading Coach app.
- Copilot+ PC Features: Microsoft Teams integration for messaging and meeting scheduling, plus an AI-powered Settings agent.
- Snap Improvements: Inline messages guide window snapping.
- Unified Search Settings: Streamlined under Settings > Privacy & Security > Search.
Fixes in KB5063878
- Resolves false Windows Firewall errors in Event Viewer.
- Fixes crashes in the Local Security Authority Subsystem Service (LSASS).
- Corrects File Explorer’s Home tab showing only one folder.
- Addresses Settings app crashes when saving Wi-Fi credentials or using the “Do nothing” laptop lid power toggle.
What’s New in KB5063875
This update focuses on security and quality improvements, incorporating fixes from the July 2025 update (KB5062663) and the servicing stack update (KB5062686). Key fixes include:
- Improved Copilot key reliability, resolving restart issues.
- Fixed sign-in delays on new devices due to preinstalled packages.
- Resolved Settings app crashes during Wi-Fi credential saving and File Explorer file operation dialog issues.
Security Updates:
- Patches one zero-day vulnerability (CVE-2025-53779, Windows Kerberos Elevation of Privilege) and 107 other flaws, including 13 critical vulnerabilities for privilege escalation, remote code execution, and information disclosure.
Deployment Tips
- Automatic Installation: Use Windows Update, Windows Update for Business, or Windows Server Update Services (WSUS) with “Windows 11” and “Security Updates” enabled.
- Manual Installation: Download from the Microsoft Update Catalog for offline systems. The combined SSU+LCU package prevents uninstallation via wusa.exe; use DISM /Remove-Package for LCU removal.
- Enterprise: Test in pilot rings, verify drivers, and monitor telemetry before broad deployment.
- Consumers: Back up data, update drivers (e.g., NVIDIA/AMD/Intel), and create a System Restore point before updating.
Known Issues
Microsoft reports no known issues for either update, but testing across various configurations continues to ensure stability.
These updates bolster Windows 11’s performance, security, and usability, setting the stage for future releases like Windows 11 25H2, which will use an enablement package for seamless upgrades from 24H2.
Install via Windows Update or the Microsoft Update Catalog for a more reliable experience.
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