Share via

Windows 11 installation

Susan Binney 0 Reputation points
2025-09-21T09:43:39.1566667+00:00

I've got the download via Installation Assistant (as it was not offered via Settings/Update). It is saying "couldn't update the system reserved partition" File manager shows there is 145GB of available space. Help, please! (and very simple advice needed, please)

Windows for home | Windows 11 | Windows update
0 comments

2 answers

Sort by: Most helpful
Most helpful Newest Oldest
  1. Ramesh Srinivasan 81,805 Reputation points Independent Advisor
    2025-09-22T03:47:29.11+00:00

    You're welcome, Susan.

    Was this answer helpful?

    0 comments
  2. Ramesh Srinivasan 81,805 Reputation points Independent Advisor
    2025-09-21T10:31:28.63+00:00

    Hi Susan,

    The error message "We couldn't update the system reserve partition" occurs if there is insufficient space in the EFI system partition. 24H2 requires at least 20 MB of free space in the EFI partition.

    We can free up the EFI partition by deleting the font files in that partition. Please open an admin Command Prompt window (instead of PowerShell) and run these commands one by one:

    mountvol Y: /s

del  /q  Y:\EFI\Microsoft\Boot\Fonts\*.ttf

powershell -command "GCI Y:\  -File -Recurse | Sort Length -descending | Select FullName, Length, Mode -first 10"

dir Y:\

    Post the output here.

    Was this answer helpful?

Your answer

Answers can be marked as 'Accepted' by the question author and 'Recommended' by moderators, which helps users know the answer solved the author's problem.