When discussing Custom Firmware (CFW) for the iPhone 4s, it’s essential to first clarify a major hardware limitation: the iPhone 4s uses a boot ROM (A5 chip) that has never been publicly exploited to allow a permanent, tethered or untethered boot-level CFW (like the iBoot exploits found on older devices like the iPhone 4 or 3GS).
When discussing Custom Firmware (CFW) for the iPhone 4s, it’s essential to first clarify a major hardware limitation: the iPhone 4s uses a boot ROM (A5 chip) that has never been publicly exploited to allow a permanent, tethered or untethered boot-level CFW (like the iBoot exploits found on older devices like the iPhone 4 or 3GS).
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