The optional update KB5101684 introduces updated Secure Boot certificates for a broader range of computers, enhancing system security. It is available for manual installation through the Microsoft Update Catalog and will be released to all users during the upcoming Patch Tuesday in August. After installation, Windows 11 25H2 will have a build number of 26200.8973, and Windows 11 24H2 will have a build number of 26100.8973.