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Re:Almost booting an iOS kernel in QEMU by KenanSulayman on Tuesday July 17, 2018 @05:25AM (#17548406)
It seems Corellium (linked to from the blogpost) has done that. That said, it seems they only run iPhone 6, et al., which was jailbroken (untethered), so it's significantly easier to emulate than trying to run the only unencrypted file (kernel cache) targeting an undocumented CPU with Qemu of an iOS beta that was released a few days ago.
Re:Almost booting an iOS kernel in QEMU by willstrafach on Thursday July 19, 2018 @04:45PM (#17570097)
Corellium can run up to iPhone X, and certainly can run iOS 12 (Option is given for jailbroken or not jailbroken too).

Only limit which you may be thinking of is that it only supports 64-bit ARM, so no emulation of the older devices.