Searching for will lead you down a rabbit hole of outdated tutorials (mostly for iPhone 6 or 7) and scammy "Custom iOS 17" download links that are either malware or stock iOS with a theme skin.
Pre-installed jailbreak tools (like Cydia or Sileo). modified ios firmware iphone 11 patched
For older devices, Apple sometimes "backports" critical security fixes to older OS versions (like iOS 18) to protect users who cannot or haven't yet updated to the newest system. Searching for will lead you down a rabbit
Future work on modified iOS firmware on the iPhone 11 could involve exploring new patched approaches, such as using machine learning-based techniques to detect and exploit vulnerabilities in the bootchain. Additionally, researchers could investigate the use of modified iOS firmware for security testing and vulnerability assessment. Future work on modified iOS firmware on the
: Older devices (iPhone X and earlier) had a hardware exploit called checkm8 . Because it was in the BootROM (permanent hardware code), Apple could never "patch" it with a software update.