Water-damaged iPhone 11 Pro Max with non-responsive Face ID and unresponsive screen

I think my phone took some water while in my pocket on a rainy day. Face ID stopped working thereafter and locked most apps that I open using Face ID. I reset the phone to factory settings, but it won't work. My second problem now is that the top screen does not respond to touch. Also the screen keeps swiping up-down and left-right at will. I tried several force restarts, but it won't fix it. I connected the iPhone to my Mac in an attempt to perform a factory reset, but the system kept displaying the message, “There was a problem downloading the software for the iPhone ‘xxxxx iPhone.’” The requested resource was not found.

Any help to get around these issues, please?

[Re-Titled by Moderator]

Original Title: My iphone 11 pro max FACE ID WONT WORK, AND ALSO THE TOP STRIP DOES NOT ALLOW TO HIT BACKWARDS