I tried to boot an iOS 12 kernelcache in QEMU: I managed to get as far as IOKit startup before receiving a kernel panic. I learned a lot about how iOS boots up with this project.[…]
the latter Apple support article on Secure Boot has been updated recently:
About Secure Boot
Mac computers that have the Apple T2 chip
[…]In other words, we have found no obvious way to break USB Restricted Mode once it is already engaged. However, we discovered a workaround, which happens to work exactly as we suggested back in May[…]
there is more info on Apple Secure Boot:
Drop EFI is a super Droplet for Mount any EFI Partition on macOS
Working for HFS+J, APFS, NTFS GPT, Core Storage volumes.