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windows 11 pro 24H2 will not install KB5087054 or KB5089549 (26100.8457) with Install error - 0x8007370a

William H 20 Reputation points
2026-06-02T18:08:01.6333333+00:00

windows 11 pro 24H2 will not install KB5087054 or KB5089549 (26100.8457)

Windows for home | Other | Windows update

Answer accepted by question author

David-M 115.2K Reputation points Independent Advisor
2026-06-03T12:23:01.7166667+00:00

Sorry for the delay in reply. I've been offline.

Thanks for the clarifications.

Error 0x8007370a typically indicates corruption in the system's component store or registry files, preventing updates from being applied. Since you don't have a third-party antivirus installed, this confirms that there is indeed corruption.

Therefore, I believe the best option to fix this in your case is to perform an In-place Upgrade to the latest version 25H2 using a Windows 11 ISO. This procedure will not only update your system to the latest version but will also repair any corruption that may be present.

It's a simple procedure, and you have the option to keep files, settings, and apps. Therefore, all your data is kept.

Download the ISO file to perform the procedure:

(If you have trouble downloading the ISO, let me know and I'll provide you with a direct link.)

  1. Access the link below;

https://www.microsoft.com/en-us/software-download/windows11

  1. Under "Download Windows 11 Disk Image (ISO) for x64 devices", click "Select download" and select "Windows 11 (multi-edition ISO for x64 devices)";
  2. Click "Download";
  3. Choose the language and click on "Confirm";
  4. Then, click "64-bit Download".
  5. Wait for the download to finish and proceed to the procedure below.

After downloading the ISO, do the following:

  1. Double-click the ISO to run;

(After running the ISO, you may need to double-click the Setup file to start the procedure.)

  1. On the "Install Windows 11" screen, uncheck "I want to help make the installation of Windows better" and select "Change how Windows Setup download updates";
  2. On the next screen, select "Not right now" and click "Next";
  3. Accept the terms of use;
  4. On the "Ready to install" screen, select "Choose what to keep" and select what you want to keep.

(It is in this step that you must select "Keep personal files and apps" so that all your data is kept.)

  1. Click on "Install" and wait for the procedure to finish. Your computer may restart several times.

At the end of the procedure, your Windows 11 will be in the latest version (25H2), and some updates may already be installed. But check Windows Update to be sure.

If you get any errors or the problem persists, please let me know.

Feel free to ask any questions you may have.

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  1. William H 20 Reputation points
    2026-06-02T20:38:14.5466667+00:00

    1 - no third party antivirus. 2 - OS Build 26100.8309

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  2. David-M 115.2K Reputation points Independent Advisor
    2026-06-02T18:42:15.48+00:00

    Hi. I'm David, and I'm happy to help you.

    To be able to assist you better, please clarify the following:

    1 = Do you have a third-party antivirus installed? If yes, which one?

    2 = Also. What is the current "OS Build" of your Windows 11?

    • Press "Windows + R", type winver, and click OK.

    If you prefer, share a screenshot. Use the shortcut "Windows + Shift + S" to use the screenshot tool.

    Be sure to censor your email address if it appears. The Microsoft Q&A is public.

    Looking forward to your reply.

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  3. AI answer

    2026-06-02T18:08:18.4566667+00:00

    KB5089549 (OS Build 26100.8457) is a May 2026 security update for Windows 11 24H2/25H2 that is known to fail in some cases, typically with error 0x800f0922, when there is insufficient free space on the EFI System Partition (ESP). This issue has been investigated and resolved by a later update.

    To get KB5087054 / KB5089549 installed successfully on Windows 11 Pro 24H2, use these supported options:

    1. Install the fixed cumulative update (preferred)
      • Install an update released on or after May 26, 2026, specifically KB5089573 or any newer cumulative update for Windows 11 24H2.
      • These newer updates contain the fix for the ESP free-space issue, so no workaround is required once they are installed.
      • After installing KB5089573 (or later), check Windows Update again; the system should be fully patched without needing special steps for KB5089549.
    2. If still on a pre–May 26, 2026 build and KB5089549 keeps failing If the device has not yet received KB5089573 or later and KB5089549 will not install, use one of the following workarounds: A. Allow update installation by modifying the ESP registry setting

      Warning: Incorrect registry edits can cause system issues. Ensure the registry is backed up first.

      1. Open Command Prompt as Administrator.
      2. Run: 
              reg add "HKLM\SYSTEM\CurrentControlSet\Control\Bfsvc" /v EspPaddingPercent /t REG_DWORD /d 0 /f
      3. Restart the device.
      4. Retry installing KB5089549 from Windows Update.
      B. Use Known Issue Rollback (KIR) (for managed/enterprise devices)
      • This issue is mitigated via Known Issue Rollback.
      • For consumer and non‑managed devices, the rollback is delivered automatically; restarting the device can help it apply faster.
      • For enterprise‑managed devices, IT admins should:
        1. Download and install the special KIR Group Policy for Windows 11 24H2/25H2:
          • KB5089549 260514_06221 Known Issue Rollback (MSI) for Windows 11 24H2/25H2.
        2. In Group Policy Editor, go to: Computer Configuration > Administrative Templates > <Group Policy name from the MSI>
        3. Enable the policy, apply it to the affected devices, and restart them.
      • This temporarily disables the change that causes the KB5089549 installation failure, allowing the update to succeed.
    3. If KB5089549 fails with a different error (for example 0x80073712)
      • One proven workaround is to manually download and install KB5089549 from the Microsoft Update Catalog instead of using Windows Update.
      • Select the correct package for Windows 11 24H2 and the device architecture (x64 for most PCs), run the .msu, let it complete, and restart.
      • If it appears to fail on the first attempt, run the .msu again before restarting.
    4. After applying any of the above
      • Open Settings > Windows Update and select Check for updates.
      • Install all pending cumulative updates, including KB5089573 or later, to ensure the device has the permanent fix and is fully up to date.

    If, after these steps, KB5087054 or KB5089549 still will not install, collect the exact error code shown in Windows Update history and review C:\Windows\Logs\CBS\CBS.log for ESP space‑related messages such as:

    • "SpaceCheck: Insufficient free space"
    • "ServicingBootFiles failed.Error = 0x70"

    These messages confirm the ESP free‑space issue and indicate that the registry/KIR workaround or installing KB5089573 (or later) is required.

    References:

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