Modify Ipsw File [extra Quality] -

If you have a device that can accept a custom or modified IPSW (such as a legacy device in Pwned DFU mode), you can attempt to flash it:

Modifying an (iPhone Software) file generally refers to creating a "custom" firmware to bypass security restrictions like Activation Lock or to gain root access (jailbreaking). While theoretically possible for research purposes, it is extremely difficult for modern iOS versions due to Apple's tight hardware-based signature checks . Core Capabilities & Tools

For these newer devices, modification is typically done on-the-fly (via kernel patching) rather than through pre-modified IPSW files.