Apple now stops signing 12.1.3, that means the user can no longer downgrade iPhone/iPad to iOS 12.1.3 from iOS 12.1.4 ie users who like to install iOS 12.1.3 can no longer install it in any way.
If you want to restore or upgrade your iPhone/iPad from iTunes it will now automatically update your device to the latest version of iOS that is iOS 12.1.4.
Apple always gives older versions of iOS to restore whenever it releases a new version so that people can have the ability to downgrade their devices to the previous version if they are not satisfied with the new one or any issues. But after some time, it stops signing the previous version and allows the latest iOS version only.
You can also visit this link https://ipsw.me to check the signing status of Apple firmware.
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