Why can’t I get the iOS 15.4 in my iPhone 6 Plus

kazarian49 wrote:

If I was to get the iOS 15.4 update on my iPhone 6+

If you were to do that, you would be performing the impossible.

The iPhone 6+, introduced by Apple nearly eight years ago, cannot be updated beyond iOS 12.5.5.

Your iPhone 6+ was released by Apple nearly eight years ago. It cannot run iOS versions greater than iOS 12.X.

If I was to get the iOS 15.4 update on my iPhone 6+ would it mess my phone up?