Iphone update

It can take a fairly long time, especially if you are updating using WiFi. As long as it is showing progress, you should let it continue.

Get help with over-the-air iOS updates          

Update – Can’t or can’t restore 

Have you tried using iTunes on a computer or Finder if running Catalina to do the update?

 Update software on iOS devices in iTunes on Mac

If you see an error when you update or restore your iPhone, iPad, or iPod   

Are you trying to update using iTunes? Does it recognize the phone?

iTunes doesn‘t recognize your iPhone, iPad, or iPod.    

You are welcome.

Try contacting them.

Apple Support Contact.    

Work through the screens to get an email or chat option.

Apple Support by e-mail or chat.    

Which iPhone? Which iOS?