Cannot install windows 11 25H2 update for ARM based pc

Thank you for your suggestions. I followed through your steps, when I ran the DISM etc command, it said file not found. The next command said that corrupted file were found, but couldn't fix. The attempts to manually update from the Microsoft Update Catalog and upgrade with the latest ARM64 ISO also failed.

If your ARM-based laptop is experiencing installation errors with the Windows 11 25H2 update, there are a few steps you can take to troubleshoot the issue:

1. Check for Known Issues: Sometimes, specific updates may have known issues that can affect installation. You can check the status of the Windows 11, version 25H2 rollout for any known problems that might be affecting your device.
2. Manual Update: If the automatic update is failing, you may try to download the update manually from the Microsoft website or use the Windows Update Assistant.
3. Free Up Space: Ensure that your device has enough storage space for the update. Insufficient space can lead to installation errors.
4. Run Windows Update Troubleshooter: Since you mentioned that the troubleshooter cannot run, you might want to try accessing it through the Settings app under "Update & Security" > "Troubleshoot" > "Additional troubleshooters".
5. Restart Your Device: Sometimes, a simple restart can resolve temporary issues that may be causing the installation to fail.
6. Check for Other Updates: Ensure that your system is fully updated with all previous updates before attempting to install the 25H2 update.

If these steps do not resolve the issue, you may need to seek further assistance from Microsoft support or check the Windows community forums for additional help specific to ARM-based devices.

References:

• Windows 11, version 25H2 known issues and notifications
• Resolved issues in Windows 11, version 25H2

I get how annoying it is when an update keeps failing like that. On ARM-based Windows devices, this usually happens because the update files get corrupted or some system components aren’t working properly, which explains why the troubleshooter won’t run.

The best way to fix it is to clear the update cache so Windows can download fresh files, then repair any broken system files.

You can do that by stopping the update services, renaming the SoftwareDistribution folder, and restarting the services, then run DISM /Online /Cleanup-Image /RestoreHealth followed by sfc /scannow in Command Prompt as admin.

Also check if you have enough free space and make sure your ARM drivers and firmware are up to date from the manufacturer’s site.

If it still fails, you can manually install the update from the Microsoft Update Catalog or use an in-place upgrade with the latest ARM64 ISO.

Do you know if your device has plenty of free space and the latest drivers installed?

Regards,
Aron