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 shapingIf you are running the beta build of iOS 15 on your iPhone, it would be vital for you to remove the profile before you proceed to install