Solution for Error 0x800f0801

This error typically occurs when trying to install a Windows feature update (like version 20H2) on an unsupported or outdated system. Here’s how to resolve it:

1. Check System Requirements:

Ensure your device meets the requirements for Windows 10, version 20H2 (e.g., free disk space, compatible hardware).

2. Run Windows Update Troubleshooter:

Go to Settings > Update & Security > Troubleshoot > Additional troubleshooters.
Select Windows Update and run the troubleshooter.

3. Restart Your Computer:

A simple restart can resolve temporary glitches blocking the update.

4. Manually Download the Update:

Visit the Microsoft Update Catalog, search for "Windows 10, version 20H2," and download the correct update for your system.
Install it manually.

5. Free Up Disk Space:

Delete unnecessary files or use Disk Cleanup (search for it in the Start menu) to ensure at least 20GB of free space.

6. Disable Third-Party Antivirus:

Temporarily disable non-Microsoft antivirus software, as it may interfere with updates.

7. Reset Windows Update Components:

Open Command Prompt as Admin (search for "cmd," right-click, and select "Run as administrator").
Run these commands one by one: net stop wuauserv net stop cryptSvc net stop bits net stop msiserver ren C:\Windows\SoftwareDistribution SoftwareDistribution.old ren C:\Windows\System32\catroot2 catroot2.old net start wuauserv net start cryptSvc net start bits net start msiserver
Restart your PC and try updating again.

8. Contact Support if Needed:

If the error persists, visit Microsoft Support for further assistance.

Note: If your Windows 10 version is truly "end of service," consider upgrading to a supported version (e.g., Windows 11 or a newer Windows 10 feature update) for security updates.