You can change the build number displayed in the bottom right corner of Windows 11 by modifying a specific registry key. This involves navigating to HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion and editing the CurrentBuildNumber string value. After updating the registry, you must restart your computer for the changes to take effect on the login screen.
Understanding the Build Number Display
The version information shown in the bottom right corner of the Windows 11 sign-in screen is not merely decorative; it is pulled directly from system registry values. This display helps users identify which update or preview build they are running, particularly important for those testing insider previews. While Microsoft intends this number to reflect the actual operating system state, some users wish to customize it for personalization or specific identification purposes. It is crucial to understand that changing this number does not alter the underlying kernel or system capabilities. It is purely a cosmetic modification of how the system reports its identity during the authentication phase. The actual functionality of Windows remains tied to the real installed version, regardless of what text appears on the screen. Misleading yourself about the actual build could lead to confusion when troubleshooting issues or applying updates. For more context on system stability, you might find it useful to review guides on PC Randomly Shuts Down with a Kernel Power (ID 41) Critical Error - Troubleshooting Guide, as system integrity is paramount even when tweaking visual elements.Preparing Your System for Registry Changes
Before making any modifications to the Windows Registry, creating a restore point is an essential safety step. The registry is a sensitive database, and incorrect edits can lead to system instability or boot failures. By creating a restore point, you ensure that you can revert to a previous state if something goes wrong during the process. Navigate to the Start menu, type "Create a restore point," and open the System Properties window. Select your main drive, usually C:, and click the "Create" button. Provide a descriptive name such as "Before Changing Build Number" and confirm the creation. This backup acts as your insurance policy against accidental errors. Additionally, ensure you have administrative privileges. Modifying keys underHKEY_LOCAL_MACHINE requires elevated permissions. If you are using a standard user account, you will need to switch to an administrator account or provide credentials when prompted. Without these rights, the edit operations will fail silently or throw access denied errors.
Modifying the Registry Key
The core of this customization lies in editing theCurrentBuildNumber value. You can achieve this using either PowerShell or the traditional Registry Editor. Both methods yield the same result, but PowerShell offers a scriptable approach while the GUI provides visual confirmation.
Using PowerShell is often faster for those comfortable with command-line interfaces. Open PowerShell as an Administrator. Run the following command to set the new build number:
New-ItemProperty -Path "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion" -Name "CurrentBuildNumber" -Value "YourCustomNumber" -PropertyType String -ForceYourCustomNumber with the desired digits. For example, setting it to 99999 will display that number. The -Force parameter ensures the command proceeds even if the key exists, overwriting the old value. If you prefer a graphical interface, press Win + R, type regedit, and navigate to the path mentioned earlier. Locate CurrentBuildNumber, double-click it, and enter your new value in the Value data field. Click OK to save.
This method is similar in principle to other customizations discussed in How to Identify and Deal with Fake Change Windows Info, where superficial changes do not alter core system metrics.
Applying and Verifying Changes
After saving the registry change, a restart is mandatory. The build number is read during the early stages of the login process, before the full desktop environment loads. Therefore, simply logging off and back on may not be sufficient; a full reboot ensures the new value is cached and displayed correctly. Once the system restarts, observe the lock screen. The bottom right corner should now display your custom number instead of the original build identifier. If the change does not appear, verify that the registry value was saved correctly. Check for typos in the key name or value data. Also, ensure that no group policies or third-party optimization tools are overriding your registry edits immediately upon startup. If you encounter issues with screen settings after such changes, refer to resources like Cannot Increase Screen-lock Time Beyond 15 Minutes on Windows 11 (Microsoft Surface Laptop 3) for related configuration troubleshooting.Risks and Considerations
While this change is generally safe, it carries inherent risks associated with registry manipulation. Incorrect paths or data types can corrupt system files. Always double-check the key path and value type. The value must remain a String; converting it to a DWORD or QWORD can cause unexpected behavior. Furthermore, be aware that future Windows updates may overwrite this custom value. When Microsoft pushes cumulative updates, the registry is often refreshed with official data. Consequently, your custom build number may revert to the actual system build after an update. This is expected behavior and indicates that the system is functioning correctly according to Microsoft's standards. Do not attempt to use this method to bypass licensing checks or fake enterprise versions. Such actions violate terms of service and can lead to security vulnerabilities. Stick to harmless numeric alterations for personal preference only.Frequently Asked Questions
Will this change affect my system performance?
No, modifying the build number string has no impact on system speed or resource usage. It is purely a cosmetic change stored in the registry. The operating system continues to function based on its actual compiled binaries and kernel version.
Can I reset the build number back to default?
Yes, you can revert the change by deleting the custom CurrentBuildNumber entry or restoring it to its original value. Alternatively, creating a system restore point before making changes allows you to roll back entirely if needed. A Windows update will also typically restore the correct value automatically.
Does this work on Windows 10 as well?
The registry path and key name are identical in Windows 10, so the method applies there too. However, the visual placement of the version info may differ slightly depending on the theme or sign-in screen customization. The underlying mechanism remains consistent across both modern Windows versions.
What happens if I enter an invalid number format?
If you enter non-numeric characters, the display might show garbled text or fail to render properly. The registry expects a string, but the UI logic anticipates numbers. Stick to valid integer sequences to ensure clean display output on the lock screen.
Is this change permanent without updates?
The change persists until you manually delete it or until a significant Windows update overwrites it. Minor patches rarely touch this specific registry key, but major feature updates often reset system identifiers to their true values. Regularly check your registry if you maintain a customized look.