How to put your iPhone or iPad in DFU mode to fix it as a last resort

DFU mode can help you recover your iPhone or iPad using a computer.

iPhone stuck on the Apple logo? 8 ways to troubleshoot.

If your iPhone is stuck on the Apple logo screen, there are several ways you can troubleshoot and solve this problem.
Ars Technica

iPhone 6S stuck in DFU mode

My iPhone 6S has bricked itself during an OS upgrade. It's now stuck in DFU mode. I've tried to put it into recovery mode by holding the home button and power button simultaneously for 10 seconds. The ...
9to5Mac

iOS 17 upgrade bug: What to do if you get stuck on the Apple logo during iPhone 15 setup

Apple has identified an iOS 17 bug that may affect the iPhone 15 upgrade experience today. During iPhone setup, the Transfer from another iPhone option may fail and leave your new iPhone in a state ...