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Mikdao's avatar
Mikdao
Copper Contributor
Mar 02, 2026

How to fix windows 11 version 25h2 install error on my pc?

I have a PC running an outdated Windows 11 23H2 OS. Recently, I want to upgrade this pc to latest Windows 11 25H2. However, the process keeps failing with error code. I tried a few solutions recommen...
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Kodyon's avatar
Kodyon
Iron Contributor
Mar 02, 2026

Check TPM and Secure Boot is a great way to resolve hardware-related barriers that prevent Windows 11 updates. It essentially verifies that your system meets the mandatory security requirements for Windows 11, ensuring the update can install without triggering errors like windows 11 version 25h2 install error 0x800f0991.

Tutorial: First, check the TPM status by pressing the Win + R key combination, entering tpm.msc, and confirming that TPM is ready and version 2.0 is displayed. Next, press Win + R, enter msinfo32, and verify that Secure Boot is enabled. If either feature is disabled, restart your computer. During boot, press F2/DEL/F12 to enter the BIOS. Navigate to the Security or Boot tab, enable TPM 2.0 and Secure Boot, save the settings, and exit. This method ensures your hardware meets Windows 11 security standards, eliminating the root cause of most installation failures.

It's particularly useful for fixing windows 11 version 25h2 install error 0x800f0991, preparing your system for major Windows 11 updates, or ensuring compatibility with new security features.