Microsoft’s May update is failing to install on some Windows 11 PCs
Microsoft's May security update KB5089549 is encountering installation failures on certain Windows 11 PCs. The issue arises due to insufficient space on the EFI System Partition, causing the installation to fail at 35-36% completion. Microsoft is aware of the problem and is providing temporary workarounds while working on a permanent solution.
- ▪The installation fails with error code 0x800f0922 on devices with limited EFI partition space.
- ▪Affected Windows 11 versions include 25H2 and 24H2, but not Windows Server editions.
- ▪Microsoft offers workarounds such as Known Issue Rollback and registry tweaks for users experiencing this issue.
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News Microsoft’s May update is failing to install on some Windows 11 PCs Windows 11 update KB5089549 fails with error 0x800f0922 on some PCs with limited EFI partition space. Here's a workaround you can use. By Hans-Christian Dirscherl Managing Editor, PC-WELT May 19, 2026 8:34 am PDT Image: Clint Patterson / Unsplash Summary created by Smart Answers AIIn summary:PCWorld reports that Microsoft’s May security update KB5089549 is failing to install on some Windows 11 devices running versions 25H2 and 24H2.The installation fails at 35-36% completion with error code 0x800f0922, caused by insufficient free space on the EFI System Partition.Microsoft offers temporary workarounds including Known Issue Rollback or registry tweaks while developing a permanent fix for future release.
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