KB5077179 (build 28000.1575) for Windows 11 26H1 drops as the February 2026 update

Windows 11 build 28000.1575 (KB5077179) arrives as the first cumulative update version 26H1.
This release includes fixes, improvements, and changes for specific devices.
Windows 11 26H1 will be exclusively availble on new devices with specific processors, and not for existing PCs.

Microsoft is rolling out Windows 11 builds 28000.1575 (KB5077179) as the February 2026 update for devices running version 26H1.

According to the changelog, the “2026-01 Security Update (KB5077179) (28000.1575)” only includes several fixes and improvements regarding graphics, .NET Framework 3.5, networking, and system reliability.

It is important to clarify that Windows 11 26H1 is not a version for current devices. Microsoft has explicitly stated that version 26H1 is not an upgrade path for Windows 11 25H2 or earlier releases.

According to the company’s newly published Microsoft Health Dashboard page, version 26H1 is a hardware-optimized release designed to enable next-generation silicon developed in partnership with device manufacturers and silicon partners. This release will be available exclusively as a preinstalled experience on select new devices beginning in early 2026, with capabilities tailored specifically for those platforms.

Microsoft is referring to the new ARM64 PCs, starting with devices powered by the Snapdragon X2 Plus, Elite, and Extreme processors. If you own a computer running on Intel or AMD hardware, Windows 11 26H1 will never be offered to your system.

What’s new on Windows 11 25H2 and 24H2 update KB5077179
Windows 11 February 2026 Patch Tuesday – Manual installation process
Windows 11 February 2026 Patch Tuesday – Update history

Important: Usually, Microsoft doesn’t release new features immediately. When a feature is announced as part of an update, it usually signals the start of a gradual rollout using the Controlled Feature Rollout (CFR) technology. Availability can vary based on region, hardware, and software configuration. For instance, some features take longer to reach users in Europe due to regulatory requirements.

What’s new on Windows 11 26H1 update KB5077179

Microsoft is currently rolling out these improvements and fixes as part of the February 2026 Security Update for Windows 11 26H1.

Graphics: Fixed an issue where certain GPU configurations could encounter a dxgmms2.sys system error that triggered a KERNEL_SECURITY_CHECK_FAILURE.
.NET Framework 3.5: Starting with Windows 11 26H1, .NET Framework 3.5 is no longer offered as a Windows Feature on Demand. It must now be installed using the standalone installer.
Networking: Fixed an issue that prevented some devices from connecting to specific WPA3‑Personal Wi‑Fi networks.
Reliability: Fixed missing BitLocker Hardware Lab Kit (HLK) tests in the Windows Hardware Compatibility Program playlist, and resolved an issue where TrustedInstaller could stop responding and prevent Windows from starting.

Windows 11 February 2026 Patch Tuesday – Manual installation process

Since there’s always a chance of problems during and after applying a quality update, it’s recommended to prepare your computer by creating a restore point and a full backup before proceeding with the installation.

To download and install this Windows 11 update, open the “Windows Update” settings and click the “Check for Updates” button.

If your computer has issues after installing this package, follow these instructions to uninstall the February 2026 update. If you’re unable to uninstall the update, follow these steps to recover your device.

The update will download and install automatically. However, you can also apply it manually by downloading the update KB5077179 from the Update Catalog website.

Windows 11 February 2026 Patch Tuesday – Update history

Final Release – Patch Tuesday (Stable Channel):
- Windows 11 25H2 build 28000.1575 release date: February 10, 2026. Official notes.