Microsoft has released cumulative update KB5095060 (Build 26220.8690) for Windows 11, version 25H2 for insiders on the Beta channel. Features and capabilities included in these builds may never reach the final release – Microsoft is testing different concepts and collecting feedback. Features may change, be removed, or replaced and may not ship beyond the Windows Insider Program. Some of them may appear in future versions of Windows when they are fully ready.
New in Windows 11 Insider Preview Build 26220.8690 Beta:
- Virtualization. Fixed an issue where after installing the latest builds, some devices could experience system crashes with HYPERVISOR_ERROR (0x20001) and KMODE_EXCEPTION_NOT_HANDLED (0x1E) errors – during system restarts, virtual machine operations, or while running certain games.
- Start menu. Improved the reliability of displaying newly installed or removed apps in the Start menu without needing to sign out or restart.
- Settings. Improved the reliability of the Settings > Apps > Startup section.
Known issues are not listed in this update; however, given that the build is intended for the Beta channel, some undocumented bugs related to experimental features may occur. Microsoft recommends reporting any unusual system behavior via the Feedback Hub.
Installation via Windows Update: Go to Settings > Windows Update and click Check for updates. A system restart is required to complete the installation. Note that this update is only available to Windows Insider Program participants on the Beta channel and is not intended for production systems.
| Feature / Change | Performance Impact | Optimization | PC Speed | Gaming Optimization |
|---|---|---|---|---|
| Virtualization: Fixed HYPERVISOR_ERROR (0x20001) and KMODE_EXCEPTION_NOT_HANDLED (0x1E) crashes | 🟢 High (+15-30% stability under VM load) | Critical hypervisor stability fix | 🟢 Eliminates random reboots during virtualization | 🟢 High (+20-40% fewer crashes in VM-heavy games/anti-cheat) |
| Start menu: Improved reliability of app list updates | ⚪ Neutral | Minor UI refresh optimization | 🟡 Slight (+1-3% faster menu rendering) | ⚪ No direct impact |
| Settings > Apps > Startup: Improved reliability | 🟡 Low (+2-5% boot consistency) | Startup item enumeration fix | 🟢 Moderate (prevents startup hangs, -0.5-1s boot time) | 🟡 Low (cleaner background resource allocation) |
Official announcement on the Microsoft website.
The last 10 Windows updates:
| Update | Build | Version | Windows | Channel | Date |
|---|---|---|---|---|---|
| KB5127757 | 28120.3181 | 26H1 | Windows 11 | Experimental | 2026-10-07 |
| KB5127758 | 26220.9606 | 25H2 | Windows 11 | Beta | 2026-10-07 |
| KB5127754 | 28020.3172 | 26H1 | Windows 11 | Beta | 2026-10-07 |
| KB5127753 | 26340.9616 | 26H2 | Windows 11 | Experimental | 2026-10-07 |
| KB5124192 | 28120.3151 | 26H1 | Windows 11 | Experimental | 2026-10-02 |
| KB5124196 | 28020.3142 | 26H1 | Windows 11 | Beta | 2026-10-02 |
| KB5124197 | 26220.9587 | 25H2 | Windows 11 | Beta | 2026-10-02 |
| KB5124193 | 26340.9596 | 26H2 | Windows 11 | Experimental | 2026-10-02 |
| KB5124166 | 26220.9568 | 25H2 | Windows 11 | Beta | 2026-09-25 |
| KB5124163 | 28020.3112 | 26H1 | Windows 11 | Beta | 2026-09-25 |