I needed to update my phone

The latest update for an iPhone 6 is iOS 12.5.2. If yours is not already updated to that, see instructions in: Update your iPhone, iPad, or iPod touch - Apple Support

Also see: About the security content of iOS 12.5.2 - Apple Support

If necessary

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      

Updating iOS: common issues and solutions