When you attempt to install an IPSW via iTunes or Finder, your computer contacts Apple’s servers to request a unique cryptographic signature (an SHSH blob). Apple will only sign firmware versions that are currently "open." If you modify a modern IPSW file: The hash of the file changes. Apple’s servers will reject the installation request. Your device will throw an Error 3194 or Error 14 in iTunes.
During a restore, iTunes/Finder contacts Apple servers to "sign" the installation. Apple only signs the latest iOS versions. modify ipsw file
An IPSW file is essentially a renamed .zip archive containing the core components required to install or restore iOS on an Apple device. When you attempt to install an IPSW via
There is an ongoing legal debate about the modification of IPSW files. While the files themselves are distributed freely by Apple, modifying them can raise intellectual property concerns. Your device will throw an Error 3194 or Error 14 in iTunes
cd ipsw_extracted/ ls -lh *dmg
A powerful command-line tool used to developer-audit, extract, and analyze IPSW files. macOS / Linux / Windows