Microsoft is starting to address an issue that hinders the installation of KB5089549 on Windows 11.
Microsoft recently issued an emergency fix to address issues arising from the KB5089549 update for Windows 11, released a few days ago.
The issue primarily impacts users attempting to update their system and encountering errors such as 0x800f0922, 0x80240069, and 0x80240031. In numerous instances, Windows initiates the update, restarts the PC, crashes during the process, and shows an error message stating that the update failed, reverting the changes and returning to the desktop.
Microsoft has acknowledged a failure and is taking steps to address it through a mechanism called Known Issue Rollback (KIR). This allows the company to fix problems caused by updates without the need for users to manually download a new package. The solution is being automatically distributed to users and companies, with restarting the PC aiding in faster application of the fix.
Why does KB5089549 encounter issues?
The issue is connected to insufficient available space on the EFI partition, also known as ESP, which is essential for storing boot files required for Windows 11 to function correctly. This partition is typically hidden to prevent accidental deletion or modification of crucial files.
The issue is that the partition is typically small, with about 100 MB on many computers. This size should be sufficient, but various files and installations can take up space in the ESP, causing problems when there is very little space left. This can lead to the KB5089549 update failing to save the necessary files.
Insufficient space-related messages like SpaceCheck: Insufficient free space ServicingBootFiles failed may indicate errors in system logs. PCs with less than 10 MB free on the EFI partition are more prone to experiencing installation failures based on test results.
In the majority of situations, Windows attempts to install the update, restarts, and begins implementing the modifications. The procedure may halt at approximately 35% or 36% and then automatically revert. Subsequently, the system resumes normal operation, but the update is still pending in Windows Update.
Some users have reported multiple restarts of their PC during installation. Microsoft explained that this may occur due to Secure Boot-related updates being rolled out gradually. Despite being unusual for a monthly update, this does not indicate system corruption.
An urgent update is currently being issued.
Microsoft employs Known Issue Rollback to fix the error. This form of remedy is implemented on the server end and typically gets to the impacted computers automatically, without requiring a separate installer download.
The company has started rolling out the update for both consumer and corporate devices that are not managed. If installation errors occur, users should reboot their computers and attempt to check for updates again in Settings > Windows Update. If the update continues to fail, it is recommended to wait a bit longer for the issue to be resolved.
What about the sluggish internet speed following the update?
Some users experienced internet slowness following the installation of KB5089549, in addition to installation issues. Although such complaints are present, they appear to be less common, and there is insufficient evidence to classify it as a widespread network problem. Microsoft had not officially recognized this issue on the Windows integrity panel at that time.
The issue acknowledged by Microsoft primarily pertains to the installation of the update rather than a decrease in internet speed. If the connection becomes slow post-update, it is advisable to restart the router, network adapter, update drivers, and check other devices on the same network before attributing the problem directly to Windows.
What is the next step for the user?
If you have not installed KB5089549 yet, begin by restarting your computer and checking Windows Update. The fix is applied automatically, so this should be sufficient to enable the installation.
If the update fails once more, it is best to wait for the emergency fix to be widely available. It is unwise to repeatedly attempt the same update if the system is still not accepting it. Following aggressive tutorials to delete EFI partition files without a clear understanding of the process is also not advised.
What is different with KB5089549?
The KB5089549 update for Windows 11 includes not only security enhancements but also introduces noticeable changes to the user experience. Notable enhancements include the new Xbox Mode, improved taskbar performance, Windows Hello fixes, settings in File Explorer, and overall system optimization for increased speed in certain areas.
The update is now available for manual installation via the Microsoft Update Catalog, offering offline installers for users who prefer to update their machines manually or for those experiencing issues with Windows Update. The file sizes are approximately 5.2 GB for x64 systems on Windows 11 25H2 and 4.7 GB for ARM64 systems on Windows 11 24H2.
Xbox mode is now available for Windows PCs 11.
Xbox Mode is a new feature in Windows 11 that provides a full-screen gaming interface, transforming PCs and laptops into a console-like gaming experience by emphasizing the gaming library and minimizing system distractions.
When activated, Xboxes Mode includes classic desktop features like desktop, taskbar, and familiar notifications for a gaming-focused navigation experience. This new feature is similar to portable gaming devices running Windows, like the ROG Ally and Legion Go, and it can also be beneficial for laptops connected to a TV.
The option may not be visible to all users right away when enabling it in Settings > Games > Xbox Mode. Microsoft typically rolls out updates gradually, meaning that some PCs may get the feature before others.
File Explorer becomes more reliable
The update addresses previous issues with the Archives Explorer, including the well-known “white flash” problem experienced by dark mode users. This issue caused a brief bright flash before loading the dark theme, which was particularly bothersome in dimly lit settings.
Windows now better retains folder preview and sorting preferences, ensuring that user-chosen view modes are consistently maintained across applications.
Microsoft has enhanced the performance of the explorer process in Windows, aiming to decrease the number of lingering processes in the background when Explorer windows are closed, thus preventing unnecessary resource usage.
Windows now has increased support for compressed files.
Windows 11 previously added built-in support for RAR and 7z formats. The recent update, KB5089549, further expands this by enabling File Explorer to handle uu, cpio, xar, and NuGet (.nupkg) files directly. While this enhancement doesn’t completely replace tools like WinRAR or 7-Zip for advanced users, it enhances the system for everyday tasks.
FAT32’s previous restriction has now been altered.
Windows has expanded the limit for formatting FAT32 volumes from 32 GB to up to 2 TB with the latest update.
NTFS and exFAT systems are preferable for most current uses, but FAT32 continues to be utilized in various devices like cameras, old equipment, consoles, and cars due to its broad compatibility.
Storage settings for faster performance
Microsoft made enhancements to the performance of storage settings. The Settings > System > Storage > Advanced storage settings > Disks and volumes section could experience slowdowns on computers with numerous disks, large SSDs, or connected external drives.
The system will be able to access these devices more effectively with KB5089549, leading to fewer interruptions and faster loading times for the disk and volume screen. Users with multiple hard drives or solid-state drives will notice an improvement.
Increased security updates and enhancements
The update addresses significant issues with commonly used resources, including enhancements to Windows Hello for better facial recognition accuracy and to prevent data loss following major system updates.
Microsoft Store has been improved to minimize errors when installing applications, such as 0x80070057, 0x80240008, and 0x80073d28. Remote Desktop has been updated to address display problems on monitors with varying scales and enhance Kerberos authentication in Remote Credential Guard sessions.
KB5089549’s modifications in relation to Secure Boot are crucial due to the impending expiration of certificates utilized by numerous Windows devices starting in June 2026, making the security aspect of this Patch Tuesday update significant.
The update assists in getting compatible PCs ready to receive new certificates gradually, minimizing the chances of failures on devices with faulty firmware. Microsoft has been handling Secure Boot modifications in recent Windows 11 updates, enhancing device compatibility.
Windows driver policy has also been updated to take a stricter stance against third-party drivers deemed unsafe.
AI elements have also received upgrades.
KB5089549 enhances internal aspects of Windows 11, such as Image Search, Content Extraction, Semantic Analysis, and Settings Model, all now at version 1.2604.515.0, aiding in local search capabilities, content analysis, and intelligent system operations.
Not all PCs will immediately get new AI resources with this change. These components serve as the foundation for current and future functions, particularly in newer machines and PCs that support advanced Windows 11 features.
Installing update KB5089549 instructions
The easiest method is to go to Settings > Windows Update and select Check for Updates. KB5089549, being a required update, should show up automatically for PCs that are compatible.
Those who opt for manual installation can access the Microsoft Updates Catalog to download the package that matches the system’s correct version and architecture, be it x64 or ARM64.
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