Here are the three most common methods for modifying an IPSW.
Understanding and Modifying IPSW Files: A Guide to Custom Firmware modify ipsw file
. If you change even one byte in the file system, the "signature" becomes invalid, and the device will refuse to install the modified IPSW unless you are using a specialized exploit (like Checkm8). 3. Rebuild the IPSW Here are the three most common methods for modifying an IPSW
Remove certain setup screens (mostly for older legacy devices). the "signature" becomes invalid