Downloading the specific "unlocks hub" IPSW file for the target device model and iOS version.

However, standard IPSW files do not unlock carrier restrictions or enable hidden features. That’s where the enters the picture.

If your goal is to unlock, downgrade, or jailbreak your iOS device, skip unverified hub downloads. Rely instead on trusted, community-vetted methods. Where to Download Official, Safe IPSW Files

What are you trying to restore?