Windows 11, version 25H2

Hi, good day!

I recommend performing a repair installation via Settings or using the ISO should fix the CBS error 0x800f0983.

Open Settings > System > Recovery.

Few things to check on the PC

• Unplug all external peripherals except for the Mouse, Keyboard, and LAN cable before starting
• Disable or uninstall any third-party Antivirus program to prevent it from interfering with the upgrade

Under Fix problems using Windows Update, click Reinstall Now

Once completed, your system will restart.

Alternatively, you can use the Windows 11 ISO by following the steps in the link below.

https://free.blessedness.top/en-us/answers/questions/4252110/how-to-run-in-place-upgrade-in-windows-11?forum=windows-all&referrer=answers

I look forward to receiving your update and I'm willing to collaborate with you till we resolve the issue. Do keep me informed by clicking "Add comment" below.

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.

Let us know if this helps!