I want to update my iPhone 6 to iOS 14

To update to the maximum of iOS 12.5.7, please see: Update your iPhone, iPad, or iPod touch - Apple Support

And: If your iPhone, iPad, or iPod touch won't update - Apple Support

If the above Apple articles do not help, please post back with relevant information. 

An iPhone 6 cannot update past iOS 12.

You can't install iOS 14 on an iPhone 6. The phone is too old.

Sorry, this is not possible.

It appears we were all on the KB at the same time.