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windows 11 update

Massimo Deiana 0 Reputation points
2026-01-03T15:06:55.3066667+00:00

i cannot install last windows 25H2 update and 3.5 dot net framework

Moved from: Windows for business | Windows for IoT

Windows for home | Windows 11 | Windows update
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  1. Harry Phan 20,455 Reputation points Independent Advisor
    2026-01-03T15:29:44.3166667+00:00

    Hello Massimo,

    If you cannot install the Windows 25H2 update together with .NET Framework 3.5, the first thing to check is whether the update is failing with a specific error code in Settings > Update & Security > Windows Update > View update history. Common codes like 0x800f081f or 0x800f0922 usually indicate missing source files or a servicing stack issue.

    For .NET Framework 3.5, the installation relies on optional features and requires access to the Windows installation media or Windows Update. If you see 0x800f081f, it means the system cannot find the required source files. In that case, mount the Windows 25H2 ISO, then run: DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /Source:D:\sources\sxs /LimitAccess (replace D: with the drive letter of your mounted ISO). This forces the installation from the correct source.

    For the 25H2 update itself, make sure the Servicing Stack Update (SSU) and the latest Cumulative Update are installed first. You can manually download them from the Microsoft Update Catalog. If the update still fails, run sfc /scannow and DISM /Online /Cleanup-Image /RestoreHealth to repair the component store. These commands often resolve corruption that blocks feature updates.

    If you are on Windows 10/11 Home, note that certain enterprise features required by .NET 3.5 may not be available unless the system has access to Windows Update. In corporate environments, WSUS or SCCM policies can also block the installation, so you may need to temporarily allow the machine to contact Microsoft Update directly.

    I recommend checking the exact error code in your update history, as that will narrow down whether the issue is source files, servicing stack, or policy restrictions. Once you have that, the DISM method with the ISO usually resolves the .NET 3.5 installation, and repairing the component store clears most update failures.

    I hope you've found something useful here. If it helps you get more insight into the issue, it's appreciated to accept the answer. Should you have more questions, feel free to leave a message. Have a nice day!

    Harry.

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  2. AI answer

    2026-01-03T15:07:05.4533333+00:00

    If you are unable to install the Windows 11 25H2 update and the .NET Framework 3.5, here are some steps you can take:

    1. Check for Known Issues: Sometimes, there are known issues with updates that can prevent installation. You can check the Windows 11 release health status for any notifications related to the 25H2 update.
    2. Troubleshoot .NET Framework Installation: For issues specifically related to .NET Framework 3.5, you might encounter errors such as 0x800f0906, 0x800f0907, 0x800f081f, or 0x800F0922. Refer to the .NET Framework 3.5 installation error for guidance on resolving these issues.
    3. Use Windows Installation Media: If you don't have an internet connection or if the above steps do not resolve your issue, you can try installing .NET Framework 3.5 using your Windows installation media. Follow the instructions on how to Deploy .NET Framework 3.5 by using Deployment Image Servicing and Management (DISM).
    4. Ensure Correct Sources: If you are not using Windows Update as the source for installing .NET Framework 3.5, ensure that you use sources from the same corresponding Windows operating system version to avoid installation failures.
    5. Check Windows Update Settings: Make sure that your Windows Update settings are configured to receive updates. You can check this by going to Settings > Windows Update and selecting Check for updates.

    If these steps do not resolve your issues, consider seeking further assistance through Microsoft support channels.

    References:

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