The issue I had isn't with the beta but with the final public release when it was released last week. I took it to a store and they suggested I need a new phone... Even though my device was working completely fine before the update. Anyone know how to downgrade the software to iOS 13?

@sheepdog1963 It seems that we are having the same issue. Any chance you were able to downgrade to iOS13? If so, how?

I don't believe this to be an off-chance device issue. I have been trying to download the public release of iOS14 update on my XS max and have been experiencing this exact boot loop issue that was described that has bricked my phone. Unfortunately, when I am able to get it connected to my Mac, it is trying to restore it with iOS 14 now that it is the latest release - so this suggested solution isn't working for me.