How to Remove iOS 15 Beta Profile From iPhone Before Installing

beta profile ios 15iOS 15.8.x is only available for iPhone 7, iPhone 7 Plus, iPhone SE (1st generation), iPhone 6s6s Plus and iPod touch (7th generation).Hello, How can I install iOS 15 and above as a beta profile on iPhone 6? Without jailbreak or any tweaks. The beta profile must be orinal.