Error 0xc1900201 When Updating to Windows 11 24H2

When you attempt to upgrade to the latest feature update (e.g., Windows 11 24H2). the following error may occur:

This PC doesn't currently meet Windows 11 system requirements.

We couldn't update system reserved partition.

The error code 0xc1900201 – 0x40008 or 0xc1900200 – 0x20008 will be logged in the setupact.log.

Info    CFreeSystemPartitionDiskSpaceChecker: checked InsufficientSystemPartitionDiskSpace, found HardBlock.Not enough space on partition [\\?\GLOBALROOT\Device\HarddiskVolume1\] Required: 15 MB. Available: 0 MB.
Info    MOUPG  ImageExit: Initializing SetupResult: [0xc1900201]
Info    MOUPG  ImageExit: Initializing Extended:    [0x40008]

(or)

Info    CFreeSystemPartitionDiskSpaceChecker: checked InsufficientSystemPartitionDiskSpace, found HardBlock.Not enough space on partition [\\?\GLOBALROOT\Device\HarddiskVolume1\] Required: 15 MB. Available: 4 MB.
Info    MOUPG  ImageExit: Initializing SetupResult: [0xc1900200]
Info    MOUPG  ImageExit: Initializing Extended:    [0x20008]

Also, deleting the optional font files (.ttf) in the EFI folder, as mentioned in the article, “We couldn’t update system reserved partition may not help in some cases.

Cause

The BIOS update images may consume vast disk space in the EFI partition.

Resizing the EFI partition using a third-party partitioning tool such as MiniTool Partition Wizard, NUIBI, or EaseUS Partition Manager should permanently fix the issue. Alternatively, deleting the font files and BIOS update images will workaround the problem.

Resolution

Step 1: Delete unneeded fonts and get the list of big files in the EFI partition

Please open an admin Command Prompt window and run these commands one by one:

mountvol Y: /s

cd /d Y:\EFI\Microsoft\Boot\Fonts

del *.ttf

dir Y:\

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

The output of the last command will show the top 10 files that consume the most space on the EFI partition.

Freeing up 20 MB of disk space in the EFI partition should resolve the Windows 11 Setup error.

If deleting the .ttf files is not enough, move the BIOS update images as mentioned below.

Step 2: Freeing up additional space on the EFI partition

You’ll need to move the BIOS images (e.g., SelfHealing.SD on Lenovo systems) to a folder on the C drive or another partition.

For HP systems:

mountvol Y: /s

md C:\HP\BIOS\Previous

md C:\HP\HP_DEVFW

cd /d Y:\EFI\HP\BIOS\Previous

move *.* C:\HP\BIOS\Previous\

robocopy Y:\EFI\HP\DEVFW C:\HP\HP_DEVFW /MIR

del Y:\EFI\HP\DEVFW\firmware.bin /a

Dir Y:\

For Dell systems:

mountvol Y: /s

md C:\Dell\BIOS

Move Y:\EFI\Dell\Bios\Recovery\* C:\Dell\BIOS\

dir Y:\

For ASUS systems

mountvol Y: /s

md C:\ASUS\BIOS

move Y:\*.bin  C:\ASUS\BIOS\

dir Y:\

For Lenovo systems:

To do so, on Lenovo systems, run these commands from the admin Command Prompt:

mountvol Y: /s

md C:\Lenovo\BIOS

cd /d Y:\EFI\Insyde

move isflash.bin C:\Lenovo\BIOS\

dir Y:\

mountvol Y: /s

xcopy /h C:\Lenovo\BIOS\Selfhealing.fd  Y:\EFI\Lenovo\BIOS\

That should do the trick. Please see if you can now install the feature update.

Editor’s note

If you wish to resize the EFI partition (which will be a permanent fix for this issue), you can use AOMEI or a similar third-party tool.

Please see:

How to Resize the EFI System Partition in Windows

Caution: It’s highly recommended that the data be backed up to an external drive before modifying the disk layout.

That should help.