efi system partition

Admins should check EFI System Partition free space before retrying KB5089549: Windows 11 24H2 and 25H2 devices failing with 0x800f0922 should be flagged when EFI free space is at or below the 10 MB risk point and escalated to the team that owns endpoint engineering, OS deployment, and disk...

Microsoft fixed the Windows 11 KB5089549 installation failure on May 26, 2026, by shipping KB5089573, a preview cumulative update for Windows 11 versions 24H2 and 25H2 that resolves rollbacks caused by EFI System Partitions with too little free space. The bug was not glamorous, but it exposed a...

Windows Update errors are fixed fastest when you diagnose the failure class first—disk runway, EFI/System Reserved partition space, component-store corruption, a known Microsoft bad patch, driver or firmware fallout, or policy targeting—and only then apply the smallest safe repair. That is the...

Microsoft released the optional Windows 11 preview update KB5089573 on May 26, 2026, for Windows 11 versions 24H2 and 25H2, moving systems to builds 26100.8524 and 26200.8524 while beginning a gradual rollout of performance changes that make core shell interactions feel faster. The headline is...

Microsoft released KB5089573 on May 26, 2026 as an optional preview cumulative update for Windows 11 versions 25H2 and 24H2, moving systems to OS builds 26200.8524 and 26100.8524 while fixing an installation failure tied to error 0x800f0922. The fix matters because the bug hit at the least...

Microsoft’s May 26, 2026 optional Windows 11 preview update, KB5089573, adds a setup-time option to choose the name of the user profile folder under C:\Users on new Windows 11 24H2 and 25H2 installations. That sounds microscopic until you remember how often Windows turns identity into...

Microsoft released the May 26, 2026 Windows 11 non-security preview update, KB5089573, for Windows 11 versions 24H2 and 25H2, bringing OS builds 26100.8524 and 26200.8524 while documenting a rollback-prone installation failure tied to cramped EFI System Partitions. That pairing is the real...

Microsoft released the optional Windows 11 KB5089573 preview update on May 26, 2026, for Windows 11 24H2 and 25H2 systems, bringing a phased performance change that accelerates app launch paths and shell surfaces such as Start, Search, Action Center, and related UI flyouts. The feature is not...

Microsoft released the May 2026 non-security preview update KB5089573 for Windows 11 versions 25H2 and 24H2 on May 26, 2026, moving those systems to OS builds 26200.8524 and 26100.8524 while also documenting a serious installation failure tied to the earlier May security update. The preview is...

Microsoft’s May 26, 2026 preview update for Windows 11 versions 25H2 and 24H2, KB5089573, advances systems to OS builds 26200.8524 and 26100.8524 while documenting a separate May security update failure tied to cramped EFI System Partitions. The headline is not just another cumulative preview...

Microsoft released KB5089573 on May 26, 2026, as the optional non-security preview update for Windows 11 version 25H2 and 24H2, moving supported systems to OS builds 26200.8524 and 26100.8524 while also documenting a lingering installation failure tied to May’s earlier KB5089549 update. The...

Microsoft confirmed that Windows 11 security update KB5089549, released May 12, 2026, can fail during reboot on Windows 11 version 24H2 and 25H2 devices with cramped EFI System Partitions, typically rolling back around 35–36 percent with error 0x800f0922. The bug is narrow, but the lesson is...

Microsoft confirmed on May 15, 2026, that Windows 11 security update KB5089549 can fail to install on some version 24H2 and 25H2 devices when the hidden EFI System Partition has roughly 10MB or less of free space available. The failure usually appears during the reboot phase, around 35 to 36...

Microsoft’s May 12, 2026 security update KB5089549 is failing to complete on some Windows 11 version 24H2 and 25H2 PCs, with installs rolling back around 35–36 percent and showing error 0x800f0922 when the EFI System Partition has too little free space. The failure is narrow enough to avoid...

Microsoft confirmed in mid-May 2026 that Windows 11 cumulative update KB5089549 can fail during installation on version 24H2 and 25H2 PCs when the EFI System Partition has roughly 10 MB or less free space, producing error 0x800f0922 and rolling back the security update. The company has pushed a...

Microsoft confirmed on May 15, 2026, that Windows 11 security update KB5089549 can fail to install on version 24H2 and 25H2 systems when the EFI System Partition has 10 MB or less of free space. The visible error is usually 0x800f0922, but the real story is less about one bad patch than about...

Microsoft confirmed on May 15, 2026, that the May 2026 Windows 11 security update KB5089549 can fail on some Windows 11 24H2 and 25H2 devices when the EFI System Partition has roughly 10MB or less free space. The failure typically arrives during the reboot phase, around 35–36 percent, then...

Microsoft acknowledged on May 15, 2026 that Windows 11 security update KB5089549, released for versions 24H2 and 25H2, can fail during installation with error 0x800f0922 on devices whose EFI System Partition has very little free space. That detail matters because this is not just another vague...

Microsoft confirmed on May 15, 2026, that Windows 11’s May security update KB5089549 can fail during installation on versions 24H2 and 25H2 when the EFI System Partition has too little free space, and it is mitigating the problem through Known Issue Rollback. That dry summary hides a more...