Windows 11 update error encountered when upgrading from Windows 10

How to fix Windows 11 update error encountered? The error code 0x80888002 - 0x40008 during the Windows 11 upgrade typically indicates compatibility or system readiness issues. Here's a step-by-step approach to troubleshoot and fix this problem:

1. Update Windows 10:
Make sure your Windows 10 system is fully updated with the latest patches and updates.
Go to Settings > Update & Security > Windows Update and click "Check for updates."

2. Run the Windows Update Troubleshooter:
Go to Settings > Update & Security > Troubleshoot > Additional troubleshooters.
Select "Windows Update" and run the troubleshooter.

3. Check for Pending Updates and Clear the Windows Update Cache:
Open Command Prompt as Administrator and run:

net stop wuauserv
net stop bits

Delete the contents of C:\Windows\SoftwareDistribution\Download.
Restart the Windows Update service:

net start wuauserv
net start bits

4. Use the Media Creation Tool:
Download the Windows 11 Media Creation Tool from Microsoft's official site.
Run the tool and choose "Upgrade this PC now" to perform an in-place upgrade, which can bypass some compatibility checks.

5. Check BIOS/UEFI Settings:
Ensure TPM 2.0 and Secure Boot are enabled in your BIOS/UEFI settings.

6. Reset Windows Update Components:
Use a script or manually reset Windows Update components to fix potential corruption.

7. Review the Setup Log Files:
If the error persists, review the setup logs (setupact.log, setuperr.log) located in C:\$Windows.~BT\Sources\Panther for detailed clues.