Install beta iOS version on an iPhone or iPad | ios 15.4 beta
Quite often apple releases beta versions of iOS. However, you will not be able to install the beta version the normal way i.e. checking the software update. Apple will indicate that the iOS is updated and won’t offer new updates. However, by registering at apple, you can actually get the beta version to your iPhone or iPad.
This tutorial shows on getting the beta iOS 15.4 but the process is exactly the same to get the future beta versions as well. This is NOT a hack and we are downloading from the official apple site (and not from the random websites).
Hope this video is useful.