| Tool | Platform | Untethered? | Best For | |------|----------|-------------|-----------| | | Mac/Linux | No (tethered) | Modern iOS 15/16 style CFW on old hardware | | OdysseusOTA2 | Mac | Yes | Downgrading to iOS 6.1.3 untethered | | Sn0wbreeze | Windows | Yes (if using saved blobs) | Windows users who want pre-bundled CFW | | iFaith | Windows | Yes | Dumping your device’s unique SHSH to build a custom restore | | CoolBooter CLI | iOS App | Yes (dual-boot) | Running two CFWs on one NAND |
: Certain "custom" IPSW (iPhone Software) files are designed to remove or bypass the Activation Lock. However, these methods often result in a "tethered" state, meaning you must re-apply the exploit if the phone restarts. Hacktivation iphone 4s cfw
: For devices without a valid SIM card, CFW can "hacktivate" the phone to allow access to the home screen and apps, though cellular services may remain inactive. Technical Prerequisites To work with custom firmware on an , you generally need: : The device must be put into Device Firmware Upgrade (DFU) | Tool | Platform | Untethered
mode by holding the Power and Home buttons in a specific sequence while connected to a computer. Checkm8-A5 Exploit Hacktivation : For devices without a valid SIM
or earlier to avoid security checks present in modern versions. Known Limitations & Risks