Windows 11 Insider Preview Build 28000.1340 (KB5072032): What’s New in the Latest Canary Channel Update

If you’re testing the bleeding-edge versions of Windows 11, the new Insider Preview Build 28000.1340—released as KB5072032—is now available in the Canary Channel. While this update looks small on paper, it quietly enables more features first introduced in the October 2025 preview, temporarily disables one new security feature, and delivers an important fix for Windows storage technologies.

Here’s a deep, fully updated look at everything included in this month’s Canary build—and why it matters to power users, sysadmins, and Windows enthusiasts.

What’s New in Windows 11 Build 28000.1340?

Microsoft breaks the update into three major categories: general system improvements, a temporary rollback of Administrator Protection, and a critical fix for Storage Spaces and Storage Spaces Direct.

✔ General Quality Improvements

This build includes a set of internal stability updates meant to polish the 28000 series. Microsoft doesn’t list each change individually, but the goal is to make the OS more responsive and consistent for early testers.

✔ More October 2025 Preview Features Are Now Enabled

Windows 11 versions 24H2 and 25H2 received a non-security preview on October 28, 2025 (KB5067036). Build 28000.1340 expands the rollout of those features inside the Canary line.

Because Canary uses Control Feature Rollout (CFR), two devices on the same build may see different features based on Microsoft’s testing waves.

Administrator Protection Temporarily Disabled

A key change in this build is the temporary deactivation of Administrator Protection, a newer security layer designed to reduce silent or background admin elevations.

Administrator Protection was originally added to Windows 11 24H2 and 25H2, and later surfaced in early 28000 builds. With 28000.1340, the feature is turned off while Microsoft refines it.

What this means for Canary testers:

• Admin approval prompts return to standard behavior.
• Background elevation restrictions introduced by Administrator Protection are paused.
• Standard User/Administrator elevation prompts still function normally.

Microsoft indicates this pause is temporary and based on feedback and telemetry.

Critical Fix for Storage Spaces & Storage Spaces Direct

The most significant technical improvement in this update affects Storage Spaces and Storage Spaces Direct, Microsoft’s virtualization-based storage technologies.

The update fixes issues that could cause:

• Some Storage Spaces volumes to become inaccessible
• Storage Spaces Direct clusters to fail during creation

For advanced testers running clustered storage or pooled disks, this change is essential. After installing the build, new clusters should create successfully, and affected pools should avoid the previous failure path.

Recommendation: As always with storage-related Canary builds, ensure you have a full, independent backup before making changes.

How This Build Fits Into the Canary Channel

The Canary Channel is where Microsoft ships the earliest, most experimental versions of Windows. These builds:

• Are not tied to a specific future Windows release
• Often contain unannounced or unfinished features
• May include bugs, missing UI, or incomplete localization
• Use Control Feature Rollout (CFR) to test new features on a subset of devices

Because of CFR, two PCs on build 28000.1340 may show different features depending on Microsoft’s rollout stage.

How to Install Windows 11 Build 28000.1340

Install via Windows Update (Recommended)

1. Open Settings > Windows Update.
2. Ensure Get the latest updates as soon as they’re available is enabled.
3. Click Check for updates.
4. Install Windows 11 Insider Preview (Canary), KB5072032.

Expect at least one reboot. Canary updates may require multiple restarts depending on your previous build.

Tip: If the device stores important test data, take a full image backup before updating.

Switching Into the Canary Channel

1. Register a Microsoft account with the Windows Insider Program.
2. Go to Settings > Windows Update > Windows Insider Program.
3. Link your Insider account.
4. Select the Canary Channel.
5. Return to Windows Update and install the latest build.

Leaving the Canary Channel (Important Warning)

You cannot downgrade from Canary to Dev/Beta/Stable without a clean reinstall, because Canary build numbers are always higher.

To leave the channel:

1. Back up all personal files, VMs, and test data.
2. Download the latest Windows 11 image from Microsoft’s official download page.
3. Boot from USB and perform a clean installation.
4. After reinstalling, you can join a lower Insider channel or return to the stable release.

Why This Build Matters

For Storage & Lab Administrators

The Storage Spaces fix is the top reason to upgrade. It restores cluster creation functionality and prevents storage pools from becoming inaccessible.

For Security Testers

The temporary removal of Administrator Protection provides a baseline for comparison once the feature returns. It’s an opportunity to test how admin elevation behaves without the new restrictions.

For Enthusiasts

This build expands the October improvements and improves OS stability — important for staying current with early platform work.

Conclusion

Windows 11 Insider Preview Build 28000.1340 may look small, but it carries important under-the-hood changes. With expanded feature rollouts, improved system reliability, a major storage fix, and the temporary pause of Administrator Protection, this update continues to refine Windows 11’s next-generation platform.

As always, Microsoft encourages Canary testers to submit feedback—especially on administrator prompts, storage behavior, and any newly visible features.