seemoo-lab/nexmon: The C-based Firmware Patching ... - GitHub
: Describe the immutable Boot ROM as the hardware root of trust. Pointer Authentication Codes (PAC) PAC on A13 modified ios firmware iphone 11 patched
The BootROM of the A13 has not been publicly cracked since its release in 2019. The security community now focuses on (like KFD or PhysPuppet) instead of persistent firmware modification. Apple has also moved to KTRR (Kernel Text Readonly Region) on A13, which prevents any runtime modification of the kernel’s code section. seemoo-lab/nexmon: The C-based Firmware Patching