Unsupported PC upgrade to 26H2 in 6-minutes only

Upgrade an Unsupported Windows 11 25H2 PC to Windows 11 26H2 Using KB5121794

This Article is for unsupported Win 11 26H2 PCs. For Supported PCs you update via Windows Update like normally you do, you will Prompted (See w11-26H2.jpg coming soon here).

Can an older PC already running Windows 11 25H2 be upgraded to Windows 11 26H2 even though its processor is not officially supported by Windows 11?

In this guide and accompanying video (COMING SOON on YouTube check here), I demonstrate the procedure on an older HP Compaq desktop with an Intel Core i5-2400 processor, already running Windows 11 25H2.

The upgrade uses KB5121794, Microsoft’s Windows 11 26H2 Enablement Package. The. xyz.msu package used in my test is hosted on Microsoft’s download infrastructure and carries a valid Microsoft digital signature (See these files: cli.txt, cli.jpg).

Educational Purposes Only

This article and accompanying video are provided for educational and testing purposes only.

Installing or upgrading Windows 11 on hardware that does not meet Microsoft’s official Windows 11 requirements remains an unsupported configuration.

Successfully completing this procedure does not make an unsupported processor officially supported by Microsoft.

Results can also vary depending on your PC hardware, drivers, Windows configuration and installed software.

IMPORTANT: Back Up Your PC Before Taking Any Action

Back up your computer before attempting this upgrade. HIGHLY RECOMMENDED: Create a System Restore Point as Recovery Points do not lose after this tiny but major upgrade.

At minimum, make sure all important documents, photographs and other personal files exist on another storage device or backup location.

For additional protection, I recommend creating a complete system-image backup before modifying the operating system.

A backup gives you a much stronger recovery option if something unexpected happens during or after the upgrade.

HIGHLY RECOMMENDED: Create a System Restore Point

I also highly recommend creating a new Windows System Restore point immediately before installing the 26H2 Enablement Package.

During my own upgrade from Windows 11 25H2 to Windows 11 26H2, I found that my existing System Restore Points retained available after the upgrade (See RestorePointsRetained.jpg), in other words haven’t lost unlike other upgrades like I think 24H2 to 25H2.

Using this enablement package, the 25H2 → 26H2 upgrade is relatively small and took only six minutes in my test (YouTube link coming soon), provided that all 25H2 updates are installed beforehand. This is much faster than performing a full Windows installation.

Nevertheless, System Restore is not a replacement for a proper backup. Do both when possible:

Back up your important files.
Preferably create a full system-image backup.
Create a fresh System Restore point.
Make sure Windows is fully updated.
Check your current Windows version with winver.
Only then proceed with the upgrade.

Windows 11 26H2 Enablement Package — KB5121794

Microsoft officially documents KB5121794 as the Feature Update to Windows 11, version 26H2 by Enablement Package.

Windows 11 24H2, 25H2 and 26H2 share a common core operating system. Microsoft describes the enablement package as a small, quick-to-install package that activates the Windows 11 26H2 features.

Microsoft also specifies KB5124010 or a later cumulative update as a prerequisite.

Before continuing, press:

Windows + R

type:

winver

and press Enter.

Confirm that your computer is running an appropriate Windows 11 installation and is fully updated. Specifically, your PC should have: Windows 11 25H2 _ 26200.9550. This is required for SIX MINUTES UPGRADE to Windows 11 26H2 _ 26300.9550 as done in my case.

Download KB5121794

For an Intel or AMD x64 PC, the package used in this demonstration is:

Windows11.0-KB5121794-x64_5e20a3cce48d6611b16bdec42b07167f5456586a.msu

Direct Microsoft-hosted download:

https://catalog.sf.dl.delivery.mp.microsoft.com/filestreamingservice/files/94520a88-858f-4832-a57d-7211f6d84a4e/public/Windows11.0-KB5121794-x64_5e20a3cce48d6611b16bdec42b07167f5456586a.msu

The file is hosted on Microsoft’s dl.delivery.mp.microsoft.com download infrastructure.

There is an important distinction here: Microsoft’s official KB5121794 support documentation confirms the existence and purpose of the Windows 11 26H2 Enablement Package, but the Microsoft support article does not currently publish this exact, xyz.msu filename or direct download URL.

Install Windows 11 26H2

Once you have completed your backups and created a System Restore point, double-click the downloaded xyz.msu file.

Windows Update Standalone Installer will process the package.

Follow the installation prompts and allow the update to complete. Save any open work and restart the computer when Windows requests it.

Because this is an enablement-package transition rather than a traditional full Windows installation, the process can be considerably smaller and faster (6 minutes for me see YouTube Link) unlike others older normal major feature upgrade.

Verify Windows 11 26H2 After Restarting from msu run

After Windows starts again, press:

Windows + R

type:

winver

and press Enter. (see msinfo32.jpg or System-About.jpg)

The About Windows dialog should now identify the operating system as:

Windows 11 Version 26H2 _ 26300.9550

You can additionally verify it through:

Settings → System → About → Windows specifications (see msinfo32.jpg or System-About.jpg)

In the accompanying video, I show the system before the upgrade, installation of the enablement package, restart and final Windows 11 26H2 _ 26300.9550 verification.

Important: Unsupported Hardware Remains Unsupported

Successfully installing Windows 11 26H2 does not make an older computer officially supported by Microsoft.

For example, the Intel Core i5-2400 used in my HP Compaq test system is an old processor that does not meet Microsoft’s official Windows 11 processor requirements.

The fact that the update package is genuine Microsoft software and installs successfully does NOT change the hardware’s support status – Windows 11 Minimum Requirements.

In other words:

Genuine Microsoft Windows + genuine Microsoft update package does not equal officially supported hardware.

Microsoft warns that Windows 11 installations on devices that do not meet the minimum system requirements are unsupported and may experience compatibility problems.

Therefore, this procedure should be treated as an unsupported Windows configuration and an educational experiment.

Conclusion

In my test, an older HP Compaq PC equipped with an Intel Core i5-2400 (see msinfo32.jpg or System-About.jpg) and already running Windows 11 25H2 _ 26200.9550 was able to transition to Windows 11 26H2 _ 26300.9550 using the KB5121794 Enablement Package in just 6-minutes.

The upgrade was relatively small compared with a traditional Windows feature installation, and my existing System Restore points remained available & intact afterward.

Your results may be different.

Back up your computer, create a fresh System Restore point, verify the package, and understand that unsupported hardware remains unsupported even when genuine Microsoft software installs successfully.

The accompanying YouTube video demonstrates the complete procedure on the actual test PC.

Verify the Microsoft Package Before Installing

As an additional security and authenticity check, I verified the downloaded .msu package using Windows PowerShell. (cli.jpg, cli.txt)

First, I calculated its SHA-256 hash:

Get-FileHash .\Windows11.0-KB5121794-x64_5e20a3cce48d6611b16bdec42b07167f5456586a.msu -Algorithm SHA256

For the package downloaded and used in my test, PowerShell returned:

SHA-256:

BF43EB13B7EBDE920C2201473BFD5C531B45E0F46ACD8E0843F27F9744FB4B43

I then checked the package’s Authenticode digital signature with:

Get-AuthenticodeSignature “.\Windows11.0-KB5121794-x64_5e20a3cce48d6611b16bdec42b07167f5456586a.msu” | Format-List Status,StatusMessage,SignerCertificate

PowerShell reported:

Status: Valid
Status Message: Signature verified.
Signer: Microsoft Corporation
Issuer: Microsoft Windows Code Signing PCA 2024
Certificate Thumbprint: B835FC295FFB94EA2FCA23B0E9C1EDA3FBA4E07D

The most important results are “Status: Valid”, “Signature verified” and “Microsoft Corporation” as the signer.

This provides additional verification that the package used in my demonstration carries a valid Microsoft digital signature.

At the time of writing, I have not located this exact SHA-256 value published by Microsoft as an official reference checksum. Therefore, the SHA-256 shown above is the hash I independently calculated from the Microsoft-hosted package used for this test; it should not be described as a Microsoft-published checksum.

For readers following this guide, I recommend performing: the same signature verification on your own downloaded file before installing it.

Microsoft References

The following official Microsoft documentation provides additional information about Windows 11 26H2, KB5121794, Windows 11 hardware requirements, unsupported hardware, and the PowerShell commands used to verify the downloaded package.

1. KB5121794 — Feature update to Windows 11, version 26H2 by using an enablement package

Microsoft’s official documentation for the Windows 11 26H2 Enablement Package. It explains the shared core between Windows 11 24H2, 25H2 and 26H2, the enablement-package mechanism, prerequisites and restart requirements.

https://support.microsoft.com/en-us/servicing/os/windows-11/2026/09/kb5121794-feature-update-to-windows-11-version-26h2

2. Windows 11 System Requirements

Microsoft’s official minimum hardware requirements for Windows 11, including supported processors, TPM 2.0, Secure Boot capability, RAM and storage requirements.

https://support.microsoft.com/en-us/windows/experience/compatibility/windows-11-system-requirements

3. Windows 11 on Devices That Don’t Meet Minimum System Requirements

Microsoft’s official explanation of what it means to install Windows 11 on unsupported hardware. Microsoft states that such installations are not recommended, are unsupported, may encounter compatibility problems and are not guaranteed to receive updates.

https://support.microsoft.com/en-us/windows/experience/compatibility/windows-11-on-devices-that-don-t-meet-minimum-system-requirements

4. PowerShell — Get-FileHash

Official Microsoft PowerShell documentation for Get-FileHash, which can be used to calculate a SHA-256 checksum for the downloaded. msu package. (cli.jpg, cli.txt)

https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.utility/get-filehash

5. PowerShell — Get-AuthenticodeSignature

Official Microsoft PowerShell documentation for Get-AuthenticodeSignature, which can be used to inspect and verify the digital signature attached to a downloaded file. (cli.jpg, cli.txt)

https://learn.microsoft.com/en-us/powershell/module/microsoft.powershell.security/get-authenticodesignature

Package Used in This Test

KB5121794 — Windows 11 26H2 Enablement Package (x64)

Filename:

Windows11.0-KB5121794-x64_5e20a3cce48d6611b16bdec42b07167f5456586a.msu

Microsoft-hosted download:

https://catalog.sf.dl.delivery.mp.microsoft.com/filestreamingservice/files/94520a88-858f-4832-a57d-7211f6d84a4e/public/Windows11.0-KB5121794-x64_5e20a3cce48d6611b16bdec42b07167f5456586a.msu

SHA-256 calculated from the package used in this test:

BF43EB13B7EBDE920C2201473BFD5C531B45E0F46ACD8E0843F27F9744FB4B43

PowerShell digital-signature verification:

Status: Valid
Status Message: Signature verified
Signer: Microsoft Corporation
Issuer: Microsoft Windows Code Signing PCA 2024

Note: The SHA-256 above was independently calculated from the downloaded package. At the time of writing, I have not located an official Microsoft page publishing this exact SHA-256 as a reference checksum.
(cli.jpg, cli.txt)

Why Leaving SSDs Unpowered for Years Can Silently Kill Your Data

Solid-state drives (SSDs) are widely trusted for speed and reliability, but they are not ideal for long-term, unpowered data storage. Unlike hard disk drives (HDDs), SSDs store data as electrical charges inside NAND flash memory cells. When an SSD remains unpowered for extended periods—months or years—those charges slowly degrade, increasing the risk of silent data corruption or complete data loss.

Modern SSDs using TLC and QLC NAND are especially vulnerable. These technologies store multiple bits per cell, which reduces tolerance to charge leakage over time. Drives that have already experienced wear from regular use degrade even faster when left inactive. In practical terms, an SSD stored in a drawer for one or two years may lose data without showing immediate errors or warnings.

Environmental factors also play a major role. Higher temperatures accelerate charge loss, and SSDs that were heavily written to before storage are more susceptible to degradation. While enterprise systems often mitigate this by periodically refreshing stored data, most home users and small businesses assume SSDs are safe as long-term archival storage, which is a risky misconception.

This does not mean SSDs are unreliable. They are excellent for active workloads, operating systems, applications, and fast-access storage. However, for cold storage and long-term archiving, traditional hard drives, optical media, or managed cloud cold storage solutions may provide better long-term data retention when used correctly.

Best practice is redundancy and maintenance.
Always back up important data to multiple storage media, and avoid keeping all copies on the same PC or NAS. Maintain at least one physically separate backup. If you must store data on an SSD, power it on every few months, perform a full read or verification pass, and validate file checksums. SMART monitoring tools like CrystalDiskInfo can help detect early warning signs before data loss becomes permanent.

A. Comparison Tables

Table 1 — SSD vs HDD vs Cloud Storage (Long-Term Archival)

Feature	SSD (Unpowered)	HDD (Magnetic)	Cloud Storage
Long-term data retention	❌ Weak (charge leakage)	✅ Strong (magnetic)	✅ Very strong (managed redundancy)
Needs periodic power	✅ Yes (every 2–6 months)	⚠️ Recommended (once per year)	❌ No
Risk of silent data corruption	⚠️ Medium–High	⚠️ Low–Medium	⚠️ Low
Susceptible to temperature	❌ High	⚠️ Medium	✅ Provider-managed
Mechanical failure	❌ None	⚠️ Possible	❌ None (user-side)
Ideal use case	OS, apps, active projects	Cold storage, archives	Off-site backup & archive
Cost per TB	⚠️ Medium–High	✅ Low	⚠️ Ongoing subscription
Offline access	✅ Yes	✅ Yes	❌ Internet required
Best for “set & forget”?	❌ No	⚠️ Limited	✅ Yes

Verdict:
👉 SSDs excel at speed, not long-term cold storage.
👉 HDDs and cloud storage are safer for multi-year archiving.

Table 2 — Storage Media Comparison (Consumer Perspective)

Storage Type	Data Retention (Unpowered)	Reliability	Speed	Best Use Case
SSD SATA	⚠️ Medium	✅ High	⚠️ Medium	Active storage, backups
SSD NVMe	⚠️ Medium–Low	✅ High	🚀 Very High	OS, performance workloads
USB Flash Drive	❌ Low	❌ Low–Medium	⚠️ Medium	Temporary file transfer
microSD Card	❌ Very Low	❌ Low	⚠️ Low	Cameras, mobile devices
OneDrive / Google Drive	✅ Very High	✅ Very High	⚠️ Internet-dependent	Off-site backup, archive

Key takeaway:
⚠️ USB sticks & microSD cards are worse than SSDs for long-term storage.

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Windows 10 End of Support: 4 Paths Forward After 14-10-2025 including buy AI-PC

Windows 10 End of Support: What Are Your Options After October 2025?

Microsoft has set the official end date for Windows 10 support: October 14, 2025. After that day, no more free security updates or bug fixes will be released. For millions of PCs still running Windows 10, this raises an urgent question: what’s next?

The good news is you have several paths forward. Each has its pros and cons, and the right choice depends on your budget, your hardware, and how long you plan to keep your current setup. Let’s break down the four main options.

1. Do Nothing – Stay on Windows 10 Without Updates

You could technically keep using Windows 10 exactly as it is. But be warned: this comes with serious risks.

Your system won’t receive security patches, leaving it increasingly vulnerable to malware, ransomware, and other cyberattacks.
Compatibility issues may pile up over time as software vendors move on.
Online services, banking apps, or even browsers could eventually refuse to work on outdated, insecure systems.

This is the “bury your head in the sand” approach. It might work for a machine that’s completely offline and used for very specific tasks, but for daily use — especially with internet access — it’s the riskiest option.

2. Stay on Windows 10 with Extended Security Updates (ESU)

If you’re not ready to jump ship yet, Microsoft is offering Extended Security Updates (ESU) for Windows 10. This allows you to keep receiving critical security patches after the official end-of-support date.

Here’s how you can enroll:

Free Option: If you’re backing up your files with OneDrive, you may be eligible for a year of ESU at no extra cost.
Rewards Option: Redeem Microsoft Rewards points (1,000 points per device) to extend security updates.
Paid Option: Purchase ESU directly for a modest one-time fee (around $30).

ESU gives you more breathing room — up to a year of continued protection — but it’s not permanent. Eventually, updates will stop, so treat this as a temporary solution while you prepare for the future.

>>>>

3. Buy a New PC – AI PC vs. Non-AI PC

For many people, the end of Windows 10 support will also be a chance to refresh hardware. If your system is more than five years old, buying a new machine could be the smoothest upgrade path.

Here’s the key decision today: AI PC or non-AI PC?

AI PC: These new devices include specialized AI hardware (like NPUs – Neural Processing Units). They’re designed to accelerate on-device AI tasks such as voice recognition, video editing, productivity tools, and next-gen Windows features. If you want to stay future-proof and plan on keeping your computer for several years, an AI PC is the smarter investment.
Non-AI PC: Traditional PCs without NPUs are still powerful and may be cheaper. If you mainly use your computer for browsing, office work, and standard apps, you may not need AI hardware — at least not yet.

Think of this as a fork in the road: AI PCs are where the industry is heading, but whether you need one today depends on your workload and budget.

4. Upgrade Your Current PC to Windows 11

If your PC meets the requirements for Windows 11, upgrading may be the easiest and cheapest option. Windows 11 will be supported until at least 2031, giving you years of updates and access to new features.

Pros:

No new hardware needed if your current PC is compatible.
Continued security patches and support for the long term.
Access to modern Windows features and optimizations.

Cons:

Not all older PCs meet the official hardware requirements.
Some people may find the new interface and layout take getting used to.

If your PC is already fairly recent, this is likely the most straightforward path.

Final Thoughts

The end of Windows 10 support isn’t the end of the world — but it does mean making a decision.

If you’re running an old machine for offline tasks, you might risk staying put.
If you need a little more time, ESU buys you a temporary extension.
If you’re due for new hardware, now’s the perfect time to consider whether an AI-powered PC makes sense.
And if your current machine is eligible, upgrading to Windows 11 is the simplest way to keep receiving support well into the next decade.

The key is not to wait until October 2025. Start planning now, and you’ll avoid a rushed, stressful transition later.

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