The Windows update fix released by Microsoft addresses installation failures tied to the KB5089549 security update for Windows 11 systems. The problem caused repeated installation errors on devices with limited EFI System Partition space and prevented some users from applying the May 2026 Patch Tuesday update successfully.
Reports about the failed update started appearing shortly after Microsoft released KB5089549 earlier this month. Many affected systems displayed error code 0x800f0922 during the installation process.
Microsoft confirms the update failure
Microsoft later confirmed that the installation issue affected systems running Windows 11 version 24H2. According to the company, devices with smaller EFI System Partitions could not complete the update process correctly.
The EFI System Partition stores important boot files required by Windows during startup and update installations. Systems with very limited free space inside the partition struggled to process the security patch.
Some users reported that Windows repeatedly attempted to install the update before rolling the system back automatically. Others experienced failed restarts and incomplete deployments across managed enterprise environments.
The issue quickly became a concern for administrators handling large numbers of Windows 11 devices because repeated failures disrupted standard update schedules.
Emergency patch fixes the problem
Microsoft has now released KB5089573 as an emergency patch to resolve the installation issue. The company said users affected by the KB5089549 failure should install the new update instead of retrying the original patch.
The Windows update fix improves compatibility for systems with smaller EFI partitions and prevents the rollback loops tied to the earlier update.
Microsoft also confirmed that enterprise administrators can deploy the replacement update through regular Windows servicing tools and management platforms.
So far, the company has not reported any known problems connected to KB5089573.
EFI partition issues continue affecting updates
EFI partition-related update failures have affected Windows systems several times in recent years. Security updates often require additional temporary boot files during installation, which can create problems on systems with very small partitions.
Microsoft previously instructed some advanced users to resize partitions manually to resolve similar installation issues. However, the latest Windows update fix removes the need for most users to make manual changes.
The incident also highlights the ongoing challenges tied to Windows servicing and compatibility across different hardware configurations.
Microsoft continues refining its update process as Windows 11 receives more frequent security and feature releases throughout the year.
Conclusion
The Windows update fix for KB5089549 should resolve the installation failures affecting Windows 11 version 24H2 systems. Microsoft’s emergency patch directly addresses the EFI partition problem and stops repeated rollback errors linked to the original security update. Users experiencing failed installations should deploy KB5089573 to complete the May 2026 security update successfully.
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