What is windows-gdid-changer?

Windows-GDID-Changer is a PowerShell script for Windows 10 and 11 that forces your machine to get a new Global Device Identifier, or GDID, from Microsoft's servers. A GDID is a persistent identifier that Windows generates once during installation, based on hardware information such as BIOS details, storage identifiers, and TPM data, and then keeps using to identify that specific Windows installation to Microsoft services. The script works by removing the device registration session data stored locally on the machine and then triggering Windows to register itself with Microsoft again, exactly the same process that normally happens right after a fresh Windows install. Microsoft's servers respond with a newly issued GDID, even if the underlying hardware has not changed, though the README notes that also changing hardware identifiers is recommended for better separation between the old and new registration. Running it requires an internet connection and administrator permissions, and the whole process usually takes somewhere between 30 and 90 seconds. The README includes a clear warning about caution on domain joined or managed systems: removing the local session and device tokens can sign you out of services such as the Microsoft Store, Xbox app, OneDrive, Microsoft 365, and Teams, and it says the script should not be used in environments that depend on Windows single sign on or Active Directory, since it may disrupt authentication there. Much of the README is background explanation rather than usage instructions. It walks through what a GDID is, citing a real court document where a Microsoft representative described it, and then details the technical registration process step by step, including the network request Windows sends to Microsoft's servers and a table mapping specific hardware identifier codes, like system manufacturer, BIOS serial number, and TPM data, to where each one is pulled from on the local machine. The author says testing was done manually in a local virtual machine on Windows 10 and 11 by inspecting the actual network traffic during registration. The README does not state a license for the script.