Updates to reserved partition issue

Stephen Connelly 0 Reputation points
2026-09-18T12:28:17.06+00:00

I get the 'We couldn't update the system reserved partition' message and Windows update stalls

Windows for home | Windows 11 | Install and upgrade
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  1. DaveM121 934.2K Reputation points Independent Advisor
    2026-09-18T13:09:07.1066667+00:00

    Please follow these steps carefully.

    Click your Start Button, then just type cmd and on the resulting list, right click Command Prompt and select 'Run as Administrator.

    Run this command in Command Prompt and press Enter.

    mountvol y: /s

    Type Y when asked to confirm the command and press Enter.

    Run this command in Command Prompt and press Enter.

    cd EFI\Microsoft\Boot\Fonts

    Run this command in Command Prompt and press Enter.

    del *.*

    Type Y when asked to confirm the command and press Enter.

    Close Command Prompt and restart your PC ,then try updating Windows again.

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  2. AI answer

    2026-09-18T12:28:35.4566667+00:00

    That message usually means the System Reserved Partition or EFI partition does not have enough free space for the update.

    Recommended path:

    1. Check whether the failed update has a specific error code.
      • In Windows 11, go to Start > Settings > Windows Update > Update history.
      • If a specific code appears, use that to guide the fix.
    2. Make sure there is enough free disk space on the device.
      • Windows upgrades require at least 16 GB free for a 32-bit OS or 20 GB for a 64-bit OS.
      • If the main drive is low on space, free space and try the update again.
    3. If using a VPN, disconnect it temporarily and try again.
      • Windows update failures such as 0x800F0922 can occur when the PC cannot connect properly to Windows Update services.
    4. Run Windows Update again.
      • Go to Start > Settings > Windows Update > Check for updates.
      • Install any available updates, then restart if prompted.
    5. Repair Windows system files, then retry the update.
      • Open Command Prompt as administrator.
      • Run: 
             DISM.exe /Online /Cleanup-image /Restorehealth
      • After it completes successfully, run: 
             sfc /scannow
      • Wait for the scan to reach 100%, close Command Prompt, and try Windows Update again.
    6. If the message specifically remains “We couldn't update the system reserved partition”, free space in that partition by following Microsoft’s official procedure.
      • This procedure is intended for advanced users and carries risk. Incorrect changes to the reserved or EFI partition can make the PC unbootable or cause data loss.
      • The Microsoft Q&A guidance for this exact issue points to the official article for freeing space in the System Reserved Partition.

    References:

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