Windows 11 could not update the System Reserved Partition: 3 Tips

by Loredana Harsana

managing editor

Loredana is a passionate writer with a keen interest in computer software and technologies. I started writing about mobile phones when the Samsung Galaxy S II was on top of the world and… Read more

  • The System Reserved partition usually stores your device’s boot and encryption information. If it becomes populated, you are sure to run into some bugs.
  • If you are running a fresh Legacy installation, bypassing the requirements of Windows 11, the partition may be too small.
  • SRP-related errors can be easily fixed using the tools built into the system or third-party software.

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When updating Windows 11 or upgrading from Windows 10 to Windows 11, you may encounter the error We were unable to update the System Reserved partition.

This may be accompanied by error codes 0xc1900104, 0x800f0922, or 0xc1900201.

What Causes System Reserved Partition Error?

This could be caused by the Full System Reserved Partition (SRP) which can no longer be written to.

In addition, some third-party security and antivirus applications write in SRP and can quickly package it. Dual booting with Linux might also be the cause of the error.

Also, if you’re running a fresh Legacy install, bypassing the Windows 11 requirements, you might have a system reserved partition of only 50MB, which is too small.

What is the function of the System Reserved Partition?

An SRP is a hidden partition in a system drive that contains important boot and system restore information.

The data includes the boot manager icon and boot configuration data, as well as the startup files used to encrypt the BitLocker drive. In Windows 10, recovery environment data is also stored in this section.

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Tampering with the System Reserved Partition may require advanced command line skills. Incorrectly entered commands may result in a non-boot state and possible data loss on the device.

What should I do if Windows 11 cannot update the System Reserved Partition?

1. Find out your partition type

  1. Right click on a file Started button and select Disk Management from the list.
  2. Now, right-click on the main partition and select properties.
  3. Click on amount tabs and you will see a file partition style in the list. In this case, it is GPT.

Although you can usually install Windows 11 on a GUID Partition Table (GPT), it is possible to do so on an MBR.

That’s why we first need to check what we’re dealing with because the solutions for the two cases are a little different.

2. Delete font files

2.1 For GUID Partition Table (GPT)

  1. tap on Started button, type poultice, and choose Run as administrator.
  2. Type the following command to set the drive letter s to me system partition and press Enters: mountvol y: /s
  3. He writes s: and press Enters to switch to s to cut.
  4. Navigate to the Fonts folder by typing the following command: cd EFI\Microsoft\Boot\Fonts
  5. Next, delete the font files in it with the following command, followed by Enters: del *.*
  6. Type Y if the system prompts you to continue deleting files.

Apparently, by removing the fonts, you should now have enough space in your SRP to proceed with upgrades or installs.

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2.2 for MBR (BIOS)

  1. Right click on a file windows button and choose Disk Management from the list.
  2. Right click on a file System reserved partitionto specify Change drive letter and paths and press Add.
  3. Choose s as the drive letter and then finally click yes to apply the changes.
  4. Next, tap research symbol, type poultice, and click Run as administrator from the resulting overlay list.
  5. He writes s: and press Enters to switch to this drive.
  6. Type the following command to change the folder to Fonts: cd Boot\Fonts
  7. Paste the following command to restore access privileges to the files in the folder: takeown /d y /r /f
  8. Next, save the permission to the drive by pasting the following command and pressing Enters: icacls Y:\* /save %systemdrive%\NTFSp.txt /c /t
  9. Displays the name of the current user’s account type who am I then press Enters.
  10. To grant access to the user, type the following command and press Enters: icacls . /grant <the username you got from whoami>:F /t
  11. Delete all files in the folder by typing the following command and pressing Enters: del *.*
  12. To restore the permissions, type the following command and press Enters: icacls Y:\ /restore %systemdrive%\NTFSp.txt /c /t
  13. Then return the ACL to the system by typing the following command and pressing Enters: icacls . /grant system:f /t
  14. Finally, hand over ownership of the drive to the system by pasting in the following command and pressing Enters to turn it on: icacls Y: /setowner “SYSTEM” /t /c

The System Reserved partition should now contain more free space. You can confirm this by checking the Disk Management console, where you should then proceed to remove the drive letter.

to remove s drive letter, right-click a file System reserved partition In the Disk Management tool and select Change the drive letter and path Just like you did in the solution.

But this time, choose File s: drive and choose Removalthen press yes to save the changes.

Restart your computer (if necessary) and proceed with the upgrade or update. The error We were unable to update the System Reserved partition It should disappear.

3. Expand the System Reserved Partition with a third-party software

If you find the above method daunting, third-party tools like MiniTool Partition Wizard and AOMEI’s Diskpart can help fix the problem.

These tools take advantage of graphical interfaces and almost one-click operations to carry out various fixes.

In particular, MiniTool Partition Wizard clearly displays the partition style and other relevant properties of each partition.

Whether it’s a GPT or MBR disk, the software includes handy tools to help you expand or shrink partitions. Just be sure to follow their documentation to the letter.

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In some third-party partition management tools, GPT disks may display as EFI System (ESP) partitions.

In short, these tools help you shrink the main C: drive and expand the system reserved partition with the resulting unallocated space.

As a last resort, you may want to consider performing a clean install of the affected version of Windows.

Essentially, a clean install resets the hard drive and creates a new System Reserved Partition from the main system drive. Remember to back up all your data before proceeding with a fresh installation.

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