3 ms·
Unfortunately, this is not the complete picture. The T2 simply programs the embedded flash within the PCH over an eSPI interface. Meaning, a successful reprogra
by aunali1 6y ago
Unfortunately, this is not the complete picture. The T2 simply programs the embedded flash within the PCH over an eSPI interface. Meaning, a successful reprogram from the T2 WILL persist until the following occurs:
- A T2 Restore
- A macOS System Update
- penwellr 6y agorickmark here: Sorry no, that's inaccurate. The T2 provides MacEFI.im4 to the Intel processor by emulating a flash controller over eSPI. So by modifying this file, and removing signature checks you can run any payload you like (see the EFI replacement video)
- MuffinFlavored 6y agoSo there is some kind of signature defeat involved, correct?
- h0m3us3r 6y agoYes, sigchecks had to be patched out of the kernel. And yes, it does not persist T2 reboot, but T2 only reboots if you hold power button for 5 sec. MacOS "reboot" does _not_ reboot T2.
- deleted 6y ago[deleted]