AI Summary

A recent Microsoft security patch has failed to install on some Windows 11 devices due to a technical issue. The problem arises when the EFI System Partition (ESP) has insufficient free space, typically 10MB or less. This causes the installation to fail during the reboot phase, approximately 35-36% through the process. Microsoft has provided an advisory with possible solutions, including changing a Windows registry setting or rolling back changes and waiting for a future update. The failure of the security patch to install leaves these devices unprotected by the dozens of patches it contained. Microsoft's recommended solutions may help resolve the issue, but the incident highlights the importance of maintaining sufficient free space on the ESP to ensure smooth system updates.

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