Microsoft has confirmed that the August 12, 2025 cumulative update for Windows 11 (KB5063878, OS Build 26100.4946) is failing to install on managed endpoints delivered through WSUS and SCCM, producing the download/install error code 0x80240069; the company is offering a temporary Known Issue...
0x80240069
admx
enterprise it
group policy
intune
kb5063878
kir
known issue rollback
lcu
os build 26100.4946
sccm
ssu
update troubleshooting
windows 11
windows update
wsus
Microsoft has confirmed that Event Viewer entries reporting a CertificateServicesClient (CertEnroll) error are appearing on Windows 11 version 24H2 after recent updates, but the company says these logs are cosmetic and do not affect running apps or network connectivity. (support.microsoft.com)...
Microsoft's August cumulative for Windows 11, KB5063878 (OS Build 26100.4946), is rolling out as a mandatory security update but is triggering a fresh wave of update failures in managed environments — most commonly a WSUS/SCCM download crash flagged with error code 0x80240069 — and...
Windows 11’s newest cumulative update brings a pragmatic — and quietly radical — addition: Quick Machine Recovery (QMR), a cloud-assisted rescue system that aims to repair unbootable PCs from within the Windows Recovery Environment. The August 12, 2025 patch (KB5063878) that delivered this...
ai settings
auto remediation
black screen
bsod redesign
cloud remediation
copilot+
enterprise it
game stability
group policy
intune
kb5063878
qmr
quick machine recovery
reagentc
telemetry privacy
windows 11
windows 11 24h2
windows resiliency initiative
winre
Microsoft’s August Patch Tuesday lands as a combined servicing stack and cumulative update that not only patches the usual security holes but also delivers a substantive set of user-facing improvements for Windows 11 version 24H2 — including Copilot+ feature updates, a redesigned...
Microsoft’s August Patch Tuesday delivers fresh cumulative updates for Windows 11 — KB5063878 for the 24H2 channel and KB5063875 for the 22621/22631 families — packaged as combined Servicing Stack Updates (SSU) plus Latest Cumulative Updates (LCU), with security fixes, reliability patches, and...
2026 expiration
ai components
august 2025
copilot ai
copilot+
firmware updates
kb5063875
kb5063878
kek db updates
lcu
oem coordination
os build 22621.5768
os build 26100.4946
patch tuesday
secure boot
secure boot certificates
ssu
windows 11
windows update for business
wsus
Windows 11 August 12, 2025 — KB5063878 (24H2) & KB5063875 (22H2 / 23H2)
An in‑depth Breakdown for WindowsForum.com (Markdown)
Short version (TL;DR)
Microsoft released the August 12, 2025 Patch Tuesday cumulative updates for Windows 11. The 24H2 servicing branch is updated as KB5063878 (OS Build...
Microsoft’s August cumulative update for Windows 11, version 24H2 — KB5063878 (OS Build 26100.4946) — ships as a combined Servicing Stack Update (SSU) plus Latest Cumulative Update (LCU), bringing routine security and quality fixes while renewing attention on an industry-wide operational...
Microsoft released the August 12, 2025 cumulative update for Windows 11, version 24H2 — KB5063878 — published as a combined Servicing Stack Update (SSU) plus Latest Cumulative Update (LCU) that installs as OS Build 26100.4946, delivers a set of security and quality fixes, and bundles targeted AI...
Microsoft has released the August 12, 2025 cumulative update for Windows 11, version 24H2 — KB5063878 (OS Build 26100.4946) — delivered as a combined Servicing Stack Update (SSU) plus Latest Cumulative Update (LCU). The package bundles security and quality fixes, small AI component updates...
Microsoft released the August 12, 2025 cumulative security update for Windows 11, version 24H2 — KB5063878 (OS Build 26100.4946) — a combined LCU+SSU package that continues July’s quality fixes, delivers component updates for Copilot+ AI features, and reiterates a critical Windows Secure Boot...
Microsoft has shipped the August 12, 2025 cumulative security update for Windows 11, version 24H2 (KB5063878, OS Build 26100.4946), a routine Patch Tuesday release that combines the latest servicing stack update with the monthly cumulative update, patches a range of security issues, and contains...
Microsoft released the August 12, 2025 cumulative security update for Windows 11, version 24H2 — KB5063878 (OS Build 26100.4946) — a routine but important monthly package that bundles the latest cumulative fixes, updates to several AI components (targeted at Copilot+ devices), and an updated...
2026 expiration
24h2
ai components
air-gapped deployment
august 2025
certificate expiration
certificate expiry 2026
configmgr
copilot ai
copilot+
enterprise rollout
firmware updates
kb5063875
kb5063878
kek ca 2011
kek ca 2023
kek db updates
lcu
oem coordination
oem firmware
os build 22621.5768
os build 26100.4946
patch tuesday
rollout testing
secure boot
secure boot certificates
servicing stack update
ssu
uefi ca 2011
windows 11
windows update
windows update for business
wsus