Upgrade iOS 12 to iOS 13? [duplicate]

Question

This question already has answers here:

Can I install any iOS version I wish by picking and choosing which firmware to restore? (3 answers)

Closed 7 months ago.

Seemingly I cannot update using the older IPSW files, only iOS 14.

I have an iPhone 7 test device with iOS 12, and I only want to update to iOS 13 (iOS 13.7).

Every attempt failed with basically the "not authorized" error. Tried with Finder, and iMazing.

How can I update to only iOS 13 (without jailbreaking)?

Answer 1

Unfortunately you cannot. iOS 14 (specifically iOS 14.1) is the current latest version of iOS available and it supports running on iPhone 7.

Apple has stopped signing iOS 13 and it’s not possible to install it over the air or via IPSW file.