Miciel wants to know if he can replace the screen in the iPhone 6 Plus. Leo says that Apple makes it really hard to change parts in the iPhone now and Apple will disable the touch ID fingerprint reader if he does. They want to do it because that's the only way to maintain the secure chain of custody of his fingerprint.
If he wants to try it, Leo recommends iFixIt.com. They not only show how to fix it, but they can sell him the parts and tools to do so. That's why a dozen states are trying to pass right to repair laws and Apple is fighting in every state.