Windows 11 Update KB5089573 Addresses Shared Audio and Boot Partition Issues

On May 26, 2026, Microsoft released update KB5089573 for Windows 11 versions 24H2 and 25H2, enhancing performance and adding features like shared audio support for multiple Bluetooth devices. This update also resolves a known issue from the previous May security update, which affected devices with limited space on the EFI System Partition, potentially preventing installation. Users with less than 10 MB free on the partition are particularly at risk. The update introduces multi-app camera support, improved Task Manager visibility for Neural Processing Units, and enhancements to the Magnifier tool. A registry workaround is available for affected devices, while consumer devices receive automatic mitigation. The update is accessible via Windows Update and the Microsoft Update Catalog.

Key Points: • KB5089573 adds shared audio support for multiple Bluetooth devices on Windows 11. • Devices with limited EFI System Partition space may face installation issues. • A registry workaround is available for affected systems to resolve installation errors.