Security researchers and forensic analysts sometimes create custom ramdisks or modified firmware images to extract data from a locked iPhone 11 or to analyse iOS internals. These uses are legitimate but require deep technical knowledge.
For the , true "modified firmware" (Custom IPSW) is largely a thing of the past due to Apple's strict SHSH blob signing and the Secure Enclave . Unlike older devices with hardware exploits (like the iPhone X and older), the iPhone 11 (A13 chip) cannot easily boot unauthorized, modified firmware images. modified ios firmware iphone 11 patched