| Tool | Compatibility | Primary Use | | :--- | :--- | :--- | | (Windows) | iPhone 2G - 4S | Build custom IPSWs with pre-installed jailbreak tools. | | PwnageTool (Mac - Legacy) | iPhone 2G - 4S | Advanced GUI tool for building “no-ramdisk” custom firmwares. | | iFaith | A4/A5 devices | Dump SHSH blobs and build signed custom IPSWs for downgrading. | | Odysseus/OdysseusOTA | 32-bit devices (A6 & older) | Desktop tool to downgrade to unsigned iOS versions using OTA blobs. | | Futurerestore | 64-bit devices (A7-A13) | Allows upgrading/downgrading within signed iOS versions using blobs. | | LibiPhoenix | Modern (checkm8 devices) | Low-level library to create custom ramdisks, not full IPSWs. |
Smaller .dmg components loaded into the device's volatile memory (RAM) during a restoration phase to wipe, partition, and flash the target flash memory. ipsw custom firmware
An file is the core firmware package format used by Apple to distribute and install operating systems across its ecosystem, including iOS, iPadOS, macOS (Apple Silicon), tvOS, and watchOS . In its vanilla form, an IPSW file is a renamed .zip archive containing system disk images, baseband configurations, bootloaders, and cryptographic manifests. | Tool | Compatibility | Primary Use |