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I don’t know about the original claim either way, but I would be even more impressed and scared if it survived an iTunes restore (basically a PC reflashes the iPhone’s OS image with an image downloaded from Apple.)

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If the malware controls the bootloader nothing will help: it can imitate any kind of restore, modifying the OS image on the fly

everything is signed.

should not be even remotely possible

Should. But we are talking about software vulnerabilities here. It means that things do not work as intended.

All code is signed on Apple’s platforms. Most exploits have a codesigning bypass of some sort.

Apple has firmware restore features in ROM. I would also assume (hope?) that there’s a procedure to enter the ROM-based restore that is impossible to intercept in software (maybe holding the power button for 10 seconds initiates a hardware reset into the ROM.)

There is.

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