Leo pushed the phone away. It sat there, dark and silent. Outside, a car with a tinted windshield idled across the street.
This is the closest you will get to "modified firmware." Dopamine uses the Fugu15 kernel exploit (CVE-2023-23520) which works on iOS 15.0 – 15.4.1 for A12–A15, including iPhone 11. modified ios firmware iphone 11 patched
If you are trying to use a tool that requires a "modified IPSW" or "PWNDFU mode" on an iPhone 11: The hardware exploit required for this was patched by Apple in the A12 processor and remains patched in the A13 (iPhone 11). Leo pushed the phone away