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Not a chance. iOS installs are cryptographically bound to the hardware itself installed on. It’s not possible to get an iPhone to boot an iOS install without an Apple server providing that cryptographic binding.

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Assuming it's implemented properly, that is. The whole reason Jailbreaks exist is due to bugs in Apple's implementations.

Almost certainly not affected; even if this new recovery mode had no signature verification at all, you would have to deal with Apple’s impenetrable-since-A12 secure boot.

Well, one will observe that I said "off grid," because I was acutely aware of the desire for them to approve OS reinstalls

I know, "but muh sekurity" and all that, but when the grandkids find an antique iPhone 16 in a barn somewhere, and want to install an iOS image upon it to see how things were in the old-times, I want that to be technically possible even after Apple shuts down the old gatekeeping servers

That's not possible because the requirement is built into the ROM. They'd have to release the keys and then you could emulate it.

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