How can I install iOS 15 and above as a beta profile on iPhone 6?

beta profile ios 15Help make the next releases of iOS, iPadOS, macOS, tvOS, watchOS and HomePod software our best yet. As a member of the Apple Beta Software Program, you can take part in shapingHelp make the next releases of iOS, iPadOS, macOS, tvOS, watchOS and HomePod software our best yet. As a member of the Apple Beta Software Program, you can take part in shaping