Users typically use a computer and a tool like iTunes or 3uTools to flash this modified file onto the device while it is in DFU (Device Firmware Update) mode.

iCloud activation is not stored locally. When an iPhone turns on, it sends its EID, IMEI, and Serial Number to Apple's activation server ( albert.apple.com ). The server responds with a "Activation Record." A custom IPSW cannot fake this response because the request is encrypted with a certificate rooted in the device's hardware (GID key). You cannot extract the GID key without advanced micro-soldering and glitching attacks.

: By removing or modifying the Setup.app file within the IPSW, developers attempt to prevent the device from ever reaching the "Activation Lock" screen during the initial setup.

: Often used for downloading specific firmware versions tailored for bypasses.

: Technically, a custom IPSW could potentially be used to modify or bypass certain iOS security features. However, creating such an IPSW requires deep knowledge of iOS, access to specific tools, and often, a good understanding of low-level programming.

The process of "hacktivation" via custom IPSW is primarily effective on older devices (e.g., iPhone 4, 4S) or those with hardware-level exploits like Extract the IPSW

: Always source firmware from reputable sites like IPSW.me to avoid malware.