iOS 13 is no longer an active iOS. The current updated iOS version is iOS 15.1
Not sure what you mean by, "gets hung and dies nothing further". What do you see on your screen when you attempt to update your iPhone?
One thing that you should know and confirm and that is whether you have an iPhone 6s or do you have an iPhone 6 (Without the S) This is important because an iPhone 6 can only be updated up to iOS 12.5.x and NOTHING HIGHER. You need an iPhone 6s to update higher than that to iOS 14.x. Double check which iPhone you have.
Open Settings ➔ General ➔ About ➔ Model Name: What does it state there?
Open Settings ➔ General ➔ About ➔ Model Name: What does it state there?
Axel F.