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Re:Checkm8 – Bootrom exploit for many iOS devices by florian_s on Friday September 27, 2019 @09:01AM (#21091431)
> What I am releasing today is not a full jailbreak with Cydia, just an exploit. Researchers and developers can use it to dump SecureROM, decrypt keybags with AES engine, and demote the device to enable JTAG. You still need additional hardware and software to use JTAG.

> During iOS 12 betas in summer 2018, Apple patched a critical use-after-free vulnerability in iBoot USB code. This vulnerability can only be triggered over USB and requires physical access. It cannot be exploited remotely. I am sure many researchers have seen that patch.

Re:Checkm8 – Bootrom exploit for many iOS devices by zeroimpl on Friday September 27, 2019 @01:37PM (#21094301)
In particular, it sounds like the same or similar bug also existed in the bootrom. So Apple patched iBoot but can't patch the bootrom.