A "Custom IPSW" is a modified version of the iOS firmware. Modders exploit a vulnerability in the iOS filesystem (specifically targeting setup.app ) to delete or rename the files responsible for the activation check. They then sign this IPSW with a developer certificate (usually a "bugged" certificate used by enterprise developers) to trick the iPhone into installing it.
If you have the original proof of purchase (receipt), Apple can often remove the Activation Lock for you at a retail store or through their website. custom ipsw icloud unlock top
: The only 100% permanent and safe method remains providing original proof of purchase to Apple or using the original owner's credentials. A "Custom IPSW" is a modified version of the iOS firmware
These often require "jailbreaking" the device and may result in losing cellular signal or certain features (like iMessage). Many "custom IPSW" videos on YouTube are scams or intended for educational research on old hardware only. Compatibility: If you have the original proof of purchase
: The standard manual method involves connecting a device in DFU (Device Firmware Update) mode and using Shift + Restore (Windows) or Option + Restore (Mac) to select the custom IPSW file. Third-Party Software :