[Note ⚠️] Foreign media reports indicate that Microsoft recently began rolling out the Windows 11 August 2025 Cumulative Update (KB5063878).
- 2025-08-20 -
[Note ⚠️] Foreign media reports indicate that Microsoft recently began rolling out the Windows 11 August 2025 Cumulative Update (KB5063878).
This update, highly anticipated by players as it fixes performance degradation issues in games and some applications in Windows 11 24H2, unexpectedly triggered another major bug, prompting an urgent official fix.
According to Windows Latest, the August 2025 Cumulative Update (KB5063878) will bring performance improvements, primarily addressing a performance degradation issue caused by the May 2025 Cumulative Update, which resulted in significant FPS drops in some games (such as Fortnite and CS:GO).
The August 2025 Cumulative Update (KB5063878) also addresses issues where PCs frequently become unresponsive, or even freeze in certain situations. For example, this could occur when using Word and switching between applications, or when playing Fortnite and using the Start button or Alt-Tab to switch to the desktop, causing the system to run much slower than usual.
Unfortunately, every time Microsoft fixes a bug, it often accidentally triggers others, and the August 2025 Cumulative Update (KB5063878) is no exception. After this update, Windows 11 24H2 systems using WSUS/SCCM (Enterprise Deployment Tools) will experience an error code 0x80240069, preventing KB5063878 from installing at all.
While this may not impact home users significantly, it could significantly impact business and enterprise environments. Microsoft has confirmed the issue and is urgently releasing a fix, which users can automatically download through Windows Update.
If updates through Windows Update, WSUS/SCCM, or elsewhere also fail, the official recommendation is to use the Media Creation Tool and select "Upgrade this PC now." Once the installation is complete, the system will function normally again.
Source: hkepc.com
This update, highly anticipated by players as it fixes performance degradation issues in games and some applications in Windows 11 24H2, unexpectedly triggered another major bug, prompting an urgent official fix.
According to Windows Latest, the August 2025 Cumulative Update (KB5063878) will bring performance improvements, primarily addressing a performance degradation issue caused by the May 2025 Cumulative Update, which resulted in significant FPS drops in some games (such as Fortnite and CS:GO).
The August 2025 Cumulative Update (KB5063878) also addresses issues where PCs frequently become unresponsive, or even freeze in certain situations. For example, this could occur when using Word and switching between applications, or when playing Fortnite and using the Start button or Alt-Tab to switch to the desktop, causing the system to run much slower than usual.
Unfortunately, every time Microsoft fixes a bug, it often accidentally triggers others, and the August 2025 Cumulative Update (KB5063878) is no exception. After this update, Windows 11 24H2 systems using WSUS/SCCM (Enterprise Deployment Tools) will experience an error code 0x80240069, preventing KB5063878 from installing at all.
While this may not impact home users significantly, it could significantly impact business and enterprise environments. Microsoft has confirmed the issue and is urgently releasing a fix, which users can automatically download through Windows Update.
If updates through Windows Update, WSUS/SCCM, or elsewhere also fail, the official recommendation is to use the Media Creation Tool and select "Upgrade this PC now." Once the installation is complete, the system will function normally again.
Source: hkepc.com
