Windows 11, version 25h2 update fail

Question

Windows 11, version 25h2 update fail

Crystal 0

I have a Galaxy Book S with 64-bit operating system, ARM-based processor. I continue to have this error with my windows update: Windows 11, version 25H2 Install error - 0xc1900101. Please advise.

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4 answers

Answer 1

Error 0xC1900101 during installation of Windows 11, version 25H2 is a driver-related upgrade error. Use the following steps in order, checking Windows Update again after each major step:

Ensure enough free disk space
- For a 64-bit OS, at least 20 GB of free space is required on the system drive.
- If needed, remove unnecessary files or apps. See the guidance in Free up drive space in Windows.
Run Windows Update multiple times
- Go to Settings > Windows Update and select Check for updates.
- Install all available updates (including drivers and firmware), restart if required, and repeat until no further updates are offered.
- If Windows Update itself shows errors, run the Windows Update Troubleshooter for Windows 11.
Update third‑party and OEM drivers
- Visit the Samsung support site for Galaxy Book S and install the latest drivers, firmware, and utilities for Windows 11 on ARM.
- Also update any drivers for external devices (docks, USB devices, etc.) from their manufacturers.
Disconnect nonessential hardware
- Unplug all external storage, docks, hubs, printers, and other peripherals that are not required for basic operation.
- Leave only keyboard, mouse, and display connected, then retry the update.
Check Device Manager for driver issues
- In the taskbar search box, type device manager and open Device Manager.
- Look for any devices with a yellow exclamation mark.
- For each such device, right‑click and choose Update driver or Uninstall (then restart) to correct the issue.
Temporarily remove third‑party security software
- Uninstall any non‑Microsoft antivirus or security suites before retrying the update.
- Ensure product keys and installers are available so they can be reinstalled later.
- Windows Defender will protect the device during this period.
Repair disk and system files (run as administrator)
- Open Command Prompt as administrator.
- Run disk check:
  - chkdsk /f C:
  - Approve scheduling if prompted, then restart to let repairs complete.
- After restart, open Command Prompt as administrator again and run:
  - DISM.exe /Online /Cleanup-image /Restorehealth
Perform a clean boot and retry
- Follow the steps in How to perform a clean boot in Windows to start Windows with minimal drivers and startup programs.
- In the clean‑boot state, run Windows Update again and attempt the 25H2 installation.

If the error persists after all of the above, collect the exact sub‑code (for example, 0xC1900101‑0x30018) from the update history and use the guidance in Resolve Windows upgrade errors, or contact Microsoft support with that code for deeper log analysis.

References:

Answer 2

GsN5034 - IA 77,990 Independent Advisor

Hello, thank you for reaching out to Microsoft Q&A.

You can try a manual upgrade using the Windows 11 25H2 ISO file.

Make sure you disconnect all of your external hard drives and other connected devices during the upgrade.

Go to the Windows 11 official Microsoft website here and download the 25H2 ISO file (``Win11_25H2_English_Arm64_v2.iso)-

https://www.microsoft.com/en-us/software-download/windows11arm64

Download the Windows 11 ISO for Arm64 devices.
Once the ISO file is downloaded, mount it and double-click Setup.exe to begin the installation.
Follow on-screen instructions to complete the upgrade.

All of your files, apps, and settings will be preserved during this upgrade.

Crystal 0 Reputation points

2026-05-04T00:53:33.35+00:00

Thank you. It seems to be frozen. It has been like this since yesterday.
GsN5034 - IA 77,990 Reputation points Independent Advisor

2026-05-04T01:48:28.7933333+00:00

Hello,

The screenshot you've uploaded here points to the Windows automatic update page.

The solution I suggested is a manual method where you will download the ISO file for your ARM-based processor from the Microsoft website and run the ISO file directly on your device. This should update your device to the latest version of Windows 11.

If you experience any issues during the upgrade, let me know.
Crystal 0 Reputation points

2026-05-04T02:06:24.27+00:00

It is currently trying to install per the instructions thank you I will let you if I have issues.
GsN5034 - IA 77,990 Reputation points Independent Advisor

2026-05-04T02:27:55.5733333+00:00

Hi,

That’s good to know.

If you run into any issues, please feel free to let me know.
Crystal 0 Reputation points

2026-05-05T02:30:37.8033333+00:00

Unfortunately, it did not install it froze at 46% looking for updates.
GsN5034 - IA 77,990 Reputation points Independent Advisor

2026-05-05T03:01:10.64+00:00

Hello,

It usually takes some time to get past the 46% progress.

May I please know how long it has been stuck at the same percentage?
Crystal 0 Reputation points

2026-05-05T03:17:45.48+00:00

For at least 8 hours. Went to bed last night at 46% woke up to it still at 46%.
GsN5034 - IA 77,990 Reputation points Independent Advisor

2026-05-05T13:10:42.19+00:00

Hello,

The error code 0xC1900101 is typically caused by a driver compatibility issue.

Could you please check if you have any BIOS, Storage controllers, or chipset driver updates pending for your device?
You can visit your PC manufacturer's website and check if you have the latest updates for your device.

If you are still having issues,

share the Panther and rollback folder. Go to,

Open File Explorer and navigate to:

C:\$WINDOWS.~BT\Sources\Panther

C:\$WINDOWS.~BT\Sources\Rollback

Upload the files to OneDrive and share the file link here.
Crystal 0 Reputation points

2026-05-05T13:33:16.18+00:00

I checked with Samsung and installed their new app needed to install any new updates for my device and it stated my device was up to date no new updates were available. I followed all of the steps the Windows AI generated content gave me prior to your guidance. I am wondering if Samsung has not rolled out the proper updates for older model products like mine even though it is only 6 years old. I may have to look into a new laptop device if I am not able to continue updating with windows :(
GsN5034 - IA 77,990 Reputation points Independent Advisor

2026-05-05T16:38:40.4666667+00:00

Hi,

May I please know the model of your Samsung device?
Type msinfo in the search bar on the taskbar and click enter.

Post a screenshot of the resulting dialog box.

Meanwhile,

We can review the Panther and Rollback log files to identify the cause of this error. Please navigate to the following location to find the files:

C:\$WINDOWS.~BT\Sources\Panther

C:\$WINDOWS.~BT\Sources\Rollback

Answer 3

Kapil Arya 38,496 Volunteer Moderator

Hello,

You can try manual upgrade using Windows 11 25H2 ISO file.

Follow these steps:

Download Windows 11 25H2 ISO from the official Microsoft website.

Double click on it to mount it to a DVD drive.

Then go to DVD drive, double click on setup.exe to proceed.

Follow on-screen instructions to complete upgrade. Alternatively, if you're on Version 24H2, you can install Version 25H2 via enablement package:

https://support.microsoft.com/en-us/topic/kb5054156-feature-update-to-windows-11-version-25h2-by-using-an-enablement-package-4d307e2d-3028-4323-bb46-552cff491643

If issue still persists, you can refer this video fix:

https://www.youtube.com/watch?v=BEO543C5g6M

Let us know if this helps!

Crystal 0 Reputation points

2026-05-04T00:51:52.7+00:00

Thank you it seems to be frozen. It has been like this since yesterday.

Answer 4

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