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.

How to update your iPhone to iOS 16 for the redesigned, customizable lock screen and new ...

The all-new iOS 16 drops on September 12. You can update your iPhone manually or automatically from the Software Update section of the Settings app.
iTechify

iOS 26 Update Stuck? How to Fix “Update Requested”, “Preparing Update”, and Failed ...

Many iPhones display "Update Requested" or stall at "Preparing Update" when attempting to install iOS 26. Learn how to fix if ...

You can now install iOS 26 on your iPhone: Everything to know about the free software update

FaceTime "Communication Safety" feature: A newer addition to iOS 26 appears to be the FaceTime "Communication Safety" feature ...
CNET

Before You Install iOS 26 or Set Up an iPhone 17, Back Up Your Data the Right Way

I'm not seeing reports of iOS 26 installs going sideways, but I still always take these steps before making a major upgrade.