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UPDATE INSTALL ERROR 0x8000ffff, updates KB5065426, KB5064401

Don S 20 Reputation points
2025-09-18T13:01:29.7133333+00:00

REPEATED FAILURES TO INSTALL KB5065426 & KB5064401, INSTALL ERROR 0x8000ffff

WINDOWS AUTOMATED HELP FAILS.

Windows for home | Windows 11 | Windows update
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  1. Ramesh Srinivasan 172.7K Reputation points Volunteer Moderator
    2025-09-20T12:10:22.3266667+00:00

    Run:

    mountvol y: /s

move Y:\EFI\Dell\Bios\Recovery\BIOS_PRE.rcv  C:\

dir Y:\

    Post the output.

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  1. Ramesh Srinivasan 172.7K Reputation points Volunteer Moderator
    2025-09-20T16:32:33.1033333+00:00

    You're welcome.

    The issue happened because the EFI partition lacked sufficient free space, as the default partition size is 100 MB, and OEM BIOS updates consumed most of the space.

    Additional note

    Unfortunately, freeing up space in the EFI partition is a temporary fix. Feature Updates, Windows Updates, and BIOS updates will fill up the space again.

    Run the commands I mentioned whenever Windows Updates fail to install due to low space in the EFI partition.

    (or)

    A permanent fix will be to resize the EFI partition to 200 MB or more using AOMEI partition assistant (free). However, backup the data (just in case) before modifying the disk layout.

    References

    Free Partition Manager for Windows PC-AOMEI Partition Assistant Standard: https://www.aomeitech.com/pa/standard.html

    How to Resize the EFI System Partition in Windows: https://www.winhelponline.com/blog/resize-efi-system-partition/

    Caution:

    The EFI partition resizing process described above is non-destructive. However, it's highly recommended that the data be backed up to an external drive before modifying the disk layout.

    1 person found this answer helpful.
  2. David-M 94,875 Reputation points Independent Advisor
    2025-09-18T13:37:08.78+00:00

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

    Please clarify the following:

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

    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.

    I await your reply.

    0 comments
  3. Don S 20 Reputation points
    2025-09-18T15:11:17.4933333+00:00

    I use Malwarebytes

    OS build 26100.4946

  4. Ramesh Srinivasan 172.7K Reputation points Volunteer Moderator
    2025-09-20T01:29:15.8366667+00:00

    Hi @Don S,

    The advisor may not see your further replies because you've marked this thread as "resolved".

    Please share your CBS logs for analysis. To collect the CBS logs, open admin PowerShell and run:

    Compress-Archive C:\Windows\Logs\CBS -f (join-path ([environment]::GetFolderPath('Desktop'))\CBS.zip)

    This creates a file named CBS.zip on your desktop. Share it on OneDrive or GoFile.io and post the link here.

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