-iphone1-2 4.2.1 8c148 Custom Restore.ipsw- !!exclusive!! [WORKING · BLUEPRINT]

Why would someone seek out a "Custom Restore" file rather than the official one? The

: The specific build number for the iOS 4.2.1 public release. -iPhone1-2 4.2.1 8C148 Custom Restore.ipsw-

: Are you trying to write code (like a tweak or app) specifically for the environment? Why would someone seek out a "Custom Restore"