Insider KB5089555 Windows 11 Insider Beta (25H2) build 26220.8491 - May 22

Windows 11 Insider Beta (25H2) build 26220.8544 - May 29

Windows Insider Blog: Check Windows Updates UUP Dump: 64-bit ISO download: https://uupdump.net/selectlang.php?id=d2206ceb-0b8c-42ac-bbc9-b594c8d80978 ARM64 ISO download: https://uupdump.net/selectlang.php?id=666ff940-4498-4198-8dc1-0c384cc1a5ec...

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Changes and improvements​

• This update includes a small number of minor bug fixes and improvements.

[Voice Access]​

• We're introducing Voice Isolation, a new option in Voice Access that helps it focus on your voice, even when others are speaking nearby. Whether you're in a shared office, an open floor plan, or at home with family around, Voice Isolation filters out other voices and background noise so Voice Access can better understand you. All processing happens privately on your device.
• Getting started
  Voice Access now offers three speech recognition modes under Voice Access settings > Improve speech recognition:
  • Voice Isolation — Filters out other speakers and background noise (one-time voice setup required).
  • Remove background noise only — Filters out non-speech sounds like typing or door slams. No additional setup needed.
  • No filtering — Default microphone input with no additional processing.
    
    
    

    Change Voice Access Speech Recognition Mode in Windows 11

    This tutorial will show you how to change the speech recognition mode used to filter noise by Voice Access for your account in Windows 11. Voice access in Windows 11 enables everyone, including people with mobility disabilities, to control their PC and author text using their voice. For...

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• To set up Voice Isolation, select it from the menu and follow the short, guided setup where you'll read a brief paragraph aloud so Voice Access can learn your voice. It only takes a minute, and your voice data never leaves your device.
  
  
  

  Set Up Voice Isolation in Voice Access on Windows 11

  This tutorial will show you how to set up Voice isolation in Voice Access for your account in Windows 11. Voice access in Windows 11 enables everyone, including people with mobility disabilities, to control their PC and author text using their voice. For example, you can open and switch between...

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[Accessibility]​

• We're introducing screen tint, a new accessibility setting that applies a color overlay across your entire display, softening its intensity so it's easier on your eyes throughout the day. If bright, saturated screens leave you with tired or sensitive eyes by the end of a long session, screen tint can help.
  
  
  

  Enable or Disable Screen Tint in Windows 11

  This tutorial will show you how to turn on or off using Screen Tint for your account in Windows 11. Starting with Windows 11 build 26300.8289 (Experimental) for Insiders, a hidden Screen Tint feature has been added. Screen Tint will show a color overlay on your display to reduce eye strain and...

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  Change Screen Tint Color in Windows 11

  This tutorial will show you how to change the Screen Tint color for your account in Windows 11. Starting with Windows 11 build 26300.8289 (Experimental) for Insiders, a hidden Screen Tint feature has been added. Screen Tint will show a color overlay on your display to reduce eye strain and...

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  Change Screen Tint Color Strength in Windows 11

  This tutorial will show you how to change the Screen Tint color strength for your account in Windows 11. Starting with Windows 11 build 26300.8289 (Experimental) for Insiders, a hidden Screen Tint feature has been added. Screen Tint will show a color overlay on your display to reduce eye...

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  Reset Screen Tint to Default in Windows 11

  This tutorial will show you how to completely reset Screen Tint back to default for your account in Windows 11. Starting with Windows 11 build 26300.8289 (Experimental) for Insiders, a hidden Screen Tint feature has been added. Screen Tint will show a color overlay on your display to reduce...

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  Screenshot showing UI for screen tint in Accessibility, with color presets and a strength slider.
• To get started, open Settings > Accessibility (or press Win + U) and look for screen tint under the Vision section. From there you can:
  • Pick from six preset colors or choose a custom color of your own.
  • Adjust the tint strength slider from a subtle wash to full intensity.
• Night light warms your display to reduce blue light that can interfere with sleep. Screen tint reduces overall screen intensity to ease eye fatigue and light sensitivity during the day. They tackle different problems and you can use both at the same time, one working on warmth and the other on intensity.
• Note that turning on screen tint will disable color filters, and vice versa. If you currently rely on color filters, you may need to keep screen tint turned off.

[Other]​

• If you were experiencing a cyclical explorer.exe crash after the previous flight (which may have looked like the screen or taskbar was blinking and repeatedly refreshing), that should be resolved after updating to this build.
• Fixed an issue causing the Energy Saver quick setting to show twice for some Insiders in recent flights.
• Fixed an issue resulting in the audio volume being unexpectedly muted on certain devices in recent flights.

Known Issues​

[Reset PC]​

• [Fixed] Resetting your PC may get stuck when using "Reset this PC." To complete the reset successfully, choose the cloud download option (Cloud PBR) instead of local.
  
  
  

  Reset Windows 11 PC

  This tutorial will show you how to reset Windows 11 and Remove everything or Keep my files. You can reset Windows 11 when your PC isn’t working well and it’s been a while since you installed an app, driver, or update. Resetting reinstalls Windows 11, but lets you choose whether to keep your...

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Reminders for Windows Insiders in the Beta Channel​

• Updates are based on Windows 11, version 25H2 via an enablement package (Build 26220.8491).
• The desktop watermark shown at the lower right corner of the desktop is normal for Windows Insider pre-release builds.
• Features and experiences included in these builds may never get released as we try out different concepts and get feedback. Features may change over time, be removed, or replaced and never get released beyond Windows Insiders. Some of these features and experiences could show up in future Windows releases when they're ready.
• Some features in active development we preview with Windows Insiders may not be fully localized and localization will happen over time as features are finalized. As you see issues with localization in your language, please report those issues to us via Feedback Hub.
• Check out Flight Hub for a complete look at what build is in which Insider channel.

Beta Preview Build 26220.8491 - Windows Insider Program

Release notes for Beta Preview Build 26220.8491

learn.microsoft.com

Announcing new builds for 22 May 2026

Hello Windows Insiders, Today, we continue to expand the rollout of the new Windows Insider Program changes to devices in channels already announced. As a reminder, we have not yet begun moving devices in the Canary 29500 Series Channel

blogs.windows.com

Download Official Windows 11 ISO file from Microsoft

This tutorial will show you how to download an official Windows Server or Windows 11 64-bit or ARM64 ISO file from Microsoft. Microsoft provides ISO files for Windows Server and Windows 11 to download. You can use these ISO files to clean install or in-place upgrade Windows 11. The Flight Hub...

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Select language for Windows 11 Insider Preview Feature Update (26220.8491) amd64

Select language for Windows 11 Insider Preview Feature Update (26220.8491) amd64 on UUP dump. UUP dump lets you download Unified Update Platform files, like Windows Insider updates, directly from Windows Update.

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Select language for Windows 11 Insider Preview Feature Update (26220.8491) arm64

Select language for Windows 11 Insider Preview Feature Update (26220.8491) arm64 on UUP dump. UUP dump lets you download Unified Update Platform files, like Windows Insider updates, directly from Windows Update.

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UUP Dump - Download Windows Insider ISO

UUP Dump is the most practical and easy way to get ISO images of any Insider Windows 10 or Windows 11 version, as soon as Microsoft has released a new build. UUP Dump creates a download configuration file according to your choices, downloads necessary files directly from Microsoft servers, and...

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