How can you fix this error code?
Perhaps you haveupgraded Windows 10 to Windows 11.
Windows 11 offers many editions and you may choose to implement the basic edition Home.
Because of some reason, you choose to upgrade Windows 11 Home to Pro.
However, when you activate the system, error 0xC004C003 happens.
This issue is also annoying in Windows 10 (including 21H1).
If you think you do have a valid license or key, select Troubleshoot below.
Error code: 0xC004C003.
Besides, you may see Windows 11 Enterprise instead of the updated version.
But if there is incorrect access, the 0xC004C003 error is triggered.
Fortunately, it’s possible for you to fix the issue.
So, lets go to check the Windows edition.
Step 1: Launch Windows 11 options via theWin + Xmenu.
If it is matched with the previous edition you have installed, skip to method 3.
If you buy a Windows 11 Home license key and install Windows 11 Pro, perform a downgrade.
Step 1: Modify Registry to Install Windows 10 Home
2.
Locate and double-click onEditionID, typeCoreSingleLanguageand clickOK.
Double-click onProductName, change its value data toWindows 10 Home, and save the change.
Double-click onEditionIDand change the data toCoreSingleLanguageand save the change.
Step 2: Downgrade to Windows 11 Home
The downgrade process requires an ISO file and an in-place upgrade.
Here is how to do it:
1.
Go to theWindows 11 download pagefrom Microsoft.
Go to the folder in which the ISO file is saved, right-tap the ISO file, and chooseMount.
In the drive folder, double-hit theexefile.
ClickChange how Setup downloads updates > Not right now.
After accepting the license terms, make sureInstall Windows 11 HomeandKeep personal files and appsare displayed.
ClickInstallto start the installation process.
Some reboots are required during the process.
Step 1: Launch Command Prompt with admin privileges in Windows 11.
Step 2: Typeslmgr.vbs rearmand pressEnter.
Step 3: ClickOKto reboot your PC when the activation is successful.
But if you replace hardware like motherboard, Windows fails to verify the validity.
As a result, Windows 11 0xC004C003 error appears.
This help document from Microsoft Reactivating Windows after a hardware changeshows you much information.
How to activate Windows 11 Pro or other editions?
This post will show you 3 simple ways for Windows 11 activation and just try one.
