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

beta profile ios 15Sning up to get the iOS and iPadOS 15 beta is super easy, and can be done by enrolling an iPhone or iPad in Apple's free Apple Beta Software Program.Download iOS 15 Developer Beta 1 IPSW Links for iPhone and iPad. Install iOS 15 or iPadOS 15 Beta 1 on Compatible iPhoneiPad from IPSW File or Confuration Profile.