Couldn’t install 14 iOS ?

Hello and welcome to Apple Support Communities, emile54.

If we understand your post correctly, you've been unable to update your iPhone. Keeping your devices up-to-date is important. We’d like to help.

Follow these steps to update:

Update your iPhone, iPad, or iPod touch

This article may also help:

If your iPhone, iPad or iPod touch won’t update

Let us know if that resolves this issue for you. 

Thanks for using the Apple Support Communities. Take care.

Welcome, emile54, to Apple Support Communities!

If you are trying to update/upgrade an iPhone 6, then this will not succeed, since an iPhone 6 cannot run iOS 13 or later.