Hi, @Mohamad Al Diab
Thank you for posting in Microsoft Q&A forum.
The error codes 0xC1900204 and 0xC1900209 during an in-place upgrade from Windows 10 to Windows 11 typically indicate issues related to the Windows setup process.
Here are some steps you can take to troubleshoot:
- Ensure that the permissions for the registry key HKLM\SYSTEM\Setup\MoSetup\Volatile are correctly set. Sometimes, insufficient permissions can prevent the upgrade process from accessing necessary registry keys.
- Verify that all devices meet the minimum system requirements for Windows 11. Even if they are marked as compatible, ensure that there are no underlying hardware or software issues.
- Ensure that all drivers are up to date. Outdated or incompatible drivers can cause issues during the upgrade process.
- Check if there is sufficient disk space available on the devices. The upgrade process requires adequate space to perform the installation.
If the answer is the right solution, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Add comment".