How to Fix Install Error 0xC1900201 in Windows 11 24H2

If you’re seeing the Windows 11 24H2 installation error 0xC1900201, it usually points to insufficient space in the EFI system partition. This issue can prevent you from upgrading your system successfully. But don’t worry—this guide will walk you through how to clean up the EFI partition and move BIOS files to fix the problem.

What Causes Error 0xC1900201?

This error occurs when your system’s EFI partition doesn’t have enough space to support the installation of the new Windows 11 update. This typically happens due to leftover fonts or BIOS image files clogging up that reserved space.

Step-by-Step Fix for Error 0xC1900201

You’ll need to delete unused font files and move BIOS image files to free up space in the EFI partition.

Step 1: Delete Fonts from the EFI Partition

Open Command Prompt as Administrator
- Click on Search, type CMD.
- Right-click Command Prompt > choose Run as administrator.
Run the following commands one by one:(Copy and paste each command into the Command Prompt and press Enter after each line.)
```
mountvol S: /s
cd /d S:\EFI\Boot\Fonts
del *.ttf
cd ..
dir
mountvol S: /d
```
This will remove old or unused font files from the EFI partition and free up space.

Step 2: Move BIOS Image Files to Another Drive

Depending on your computer’s manufacturer, you’ll need to run different commands. Again, open Command Prompt as Administrator and execute the commands for your specific brand:

For HP:

mountvol S: /s
cd /d S:\EFI\HP\BIOS
move *.bin D:\Backup
mountvol S: /d

For Lenovo:

mountvol S: /s
cd /d S:\EFI\Lenovo\BIOS
move *.bin D:\Backup
mountvol S: /d

For Dell:

mountvol S: /s
cd /d S:\EFI\Dell\BIOS
move *.bin D:\Backup
mountvol S: /d

For ASUS:

mountvol S: /s
cd /d S:\EFI\ASUS\BIOS
move *.bin D:\Backup
mountvol S: /d

Ensure that D:\Backup is a valid folder or replace it with any preferred destination path.

Complete the Installation

Once you’ve cleared up the EFI partition:

Run the Windows 11 24H2 Setup File manually to install the update.
If you prefer using Windows Update, the error should no longer appear after performing the cleanup steps.

FAQs

Q1: What is the EFI Partition?
A: The EFI System Partition (ESP) is a reserved area of your hard drive used to store boot files and essential firmware. Windows needs adequate space here for successful upgrades.

Q2: Is it safe to delete fonts and BIOS files from the EFI partition?
A: Yes, as long as you only delete non-essential or old files. Always back up files before making changes.

Q3: Can I resize the EFI partition instead?
A: Technically yes, but it’s riskier and more complex. Cleaning up files is the safer and easier method.

Q4: Will this error happen again?
A: Possibly, especially if new BIOS or boot files accumulate. Repeat the cleanup process if needed before future updates.

Final Thoughts

Windows installation error 0xC1900201 is frustrating, but it’s easily fixable by freeing up space in your system’s EFI partition. Follow the steps above carefully, and you should be able to upgrade to Windows 11 24H2 without a hitch.