This exact same thing happened to me today, December 17, 2023. I assumed Apple had worked out the bugs regarding the iOS 17.2 update, so I decided to update my iPhone 15 Pro, big mistake. The screen is no longer responding to any input. The side buttons work. iTunes says the phone is in DFU mode, even though the screen says "Your iPhone has been updated to iOS 17.2."
I use a VPN on my phone (Proton VPN). Does anyone else who has had this non-responsive screen issue use a VPN? I changed the password for my VPN, figuring that the phone would not be able to login using it. This did not help. I read on another website that this problem may be related to how this update interacts with a VPN.
My PSA: do not trade-in your old phone! It's better to throw it in a drawer! I'm going to be able to call AT&T and switch back to my iPhone 7. I only had to add my work email and Slack back onto my iPhone 7 and I'm able to continue working and go on my holiday vacation.
Meanwhile, we need a fix from Apple.