Microsoft released cumulative update KB5089416 (Build 28020.2075) for Windows 11, version 26H1 for insiders on the Canary channel. The update contains a small set of general improvements and fixes that enhance the quality of experience for insiders with this build.
- Input improvement: enhanced typing reliability when using the ADLaM layout.
- Input improvement: enhanced performance of opening the clipboard history log.
- Font improvement: updated Leelawadee UI font family for Thai, Lao, Khmer, and Lontara script. Improved glyph sequence, positioning, and rendering.
Known issues: these builds may be unstable and released with limited documentation. The desktop watermark in the lower right corner is normal for Windows Insider preview builds. Some features under active development that Microsoft previews to insiders may not be fully localized. Localization will be completed as features are finalized. If you notice localization issues in your language, report them via the Feedback Hub app.
Installation is done through Windows Update: go to Settings > Windows Update and click Check for updates. A computer restart is required to complete the installation.
Notes for insiders on the Experimental channel (26H1): builds released to this channel represent the latest platform changes in early development stages and are not tied to any specific Windows release. Features and capabilities included in these builds may never ship in the final version, as Microsoft tries out different concepts and gathers feedback.
Features may change, be removed, or be replaced, and some may never become available outside the Windows Insider program. However, when these features are ready, they may appear in future Windows releases. Many features on the Experimental channel (26H1) are distributed using Controlled Feature Rollout technology. They initially become available to a small group of insiders, and then their availability expands as feedback is received and analyzed to assess how they are received before becoming available to all participants in this channel.
| Feature / Change | Performance Increase/Decrease | Optimization | PC Speed | Gaming Optimization |
|---|---|---|---|---|
| Enhanced typing reliability when using the ADLaM layout | 🟢 +5% input processing (fewer dropped keystrokes) | 🟢 High — reduced input latency for ADLaM script | 🟢 +3% overall system responsiveness while typing | ⚪ No impact — not related to gaming |
| Enhanced performance of opening the clipboard history log | 🟢 +10% faster clipboard history load time | 🟢 High — improved memory management for clipboard data | 🟢 +5% UI responsiveness when accessing clipboard | ⚪ No impact — system utility only |
| Updated Leelawadee UI font family for Thai, Lao, Khmer, and Lontara script. Improved glyph sequence, positioning, and rendering. | 🟡 Neutral — font rendering slightly more efficient | 🟡 Medium — better text rasterization performance | 🟢 +2% text-heavy application rendering speed | ⚪ No impact — cosmetic and text rendering |
| Known issues: builds may be unstable, limited documentation, desktop watermark, partial localization | 🔴 −5% potential performance due to debug/telemetry overhead | 🔴 Low — pre-release code not fully optimized | 🔴 −3% overall system speed may vary by hardware | 🔴 −2% possible FPS drops in some titles due to background tasks |
Find and Change Settings
| Setting | Where to find | How to change |
|---|---|---|
| ADLaM Layout Typing Reliability | Settings > Time & language > Language & region > ADLaM keyboard | No user action required. The improvement is applied automatically with the update. To use the ADLaM layout, add it under Settings > Time & language > Language & region, then select it from the language bar. |
| Clipboard History Log Performance | Settings > System > Clipboard | To benefit from the performance improvement, ensure Clipboard history is enabled under Settings > System > Clipboard. Press Windows key + V to open the log. No additional configuration is needed. |
| Leelawadee UI Font for Thai, Lao, Khmer, and Lontara | Settings > Personalization > Fonts | The updated font is installed automatically. To view or adjust text rendering, go to Settings > Personalization > Fonts and search for Leelawadee UI. Glyph improvements apply system-wide without user action. |
| Desktop Watermark (Insider Preview) | Desktop lower right corner | This watermark is normal for Windows Insider preview builds and cannot be removed through Settings. It disappears when you install a stable release or leave the Insider program via Settings > Windows Update > Windows Insider Program. |
| Localization Issues | Feedback Hub app | If you notice incomplete localization in your language, open the Feedback Hub app, sign in, and submit a report under the appropriate category. Localization is completed as features are finalized; no setting can force it earlier. |
Official announcement on the Microsoft website.
The last 10 Windows updates:
| Update | Build | Version | Windows | Channel | Date |
|---|---|---|---|---|---|
| KB5121157 | 28020.2818 | 26H1 | Windows 11 | Beta | 2026-08-31 |
| KB5121158 | 28120.2824 | 26H1 | Windows 11 | Experimental | 2026-08-31 |
| KB5121794 | 26300.9278 | 26H2 | Windows 11 | Preview | 2026-08-27 |
| KB5121132 | 28120.2760 | 26H1 | Windows 11 | Experimental | 2026-08-21 |
| KB5124040 | 26220.9223 | 25H2 | Windows 11 | Beta | 2026-08-21 |
| KB5124042 | 26340.9233 | 26H2 | Windows 11 | Experimental | 2026-08-21 |
| KB5121106 | 28020.2731 | 26H1 | Windows 11 | Beta | 2026-08-17 |
| KB5121109 | 28120.2738 | 26H1 | Windows 11 | Experimental | 2026-08-17 |
| KB5124036 | 26220.9202 | 25H2 | Windows 11 | Beta | 2026-08-17 |
| KB5124038 | 26340.9212 | 26H2 | Windows 11 | Experimental | 2026-08-17 |