Microsoft resolves Windows 11 installation error 0x800f0922 caused by small EFI partitions (opens in new tab)

Microsoft has addressed a persistent issue that caused the May 2026 security update, KB5089549, to fail on various Windows 11 devices. The problem specifically affected systems where the EFI System Partition (ESP) had 10 MB or less of available free space. During the installation process, affected machines would typically encounter a failure and trigger an automatic rollback during the reboot phase at approximately 35% completion. <a href="