Apple Halts Baseband Firmware Signing for iPhone 4 Through 5c

The change blocks cellular updates and device restorations on hardware that first shipped more than a decade ago.

Apple has stopped signing baseband firmware for the iPhone 4, 4s, 5, 5s, and 5c. Without those signatures, owners cannot restore or update the cellular modem components on those models even when the devices remain in working order.

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