Introduction

With the current state of Apple EFI and SMC version mismatch and Loki malware, an external bootable utility is required to flash a MacBook to a known good state.

Methodology

• Create EFI bootable media with two partitions
  • ESP including utilities
  • FAT32 volume to write logging and data out to
• Download last known EFI and SMC from Apple *.pkg files and extract with lsbom etc
• A routine that flashes using the following series of steps
  • Reset SMC to base by calling smcutil.efi -reset 1
  • Flash SMC using smcutil.efi
  • Reset SMC to update by calling smcutil.efi -reset 2
  • Flash SMC using smcutil.efi
  • Reset SMC to application mode by calling smcutil.efi -reset 3
  • Flash EFI using efiutil.efi to the latest version for a given model

Progress

The current versions of these files can be extracted from the scripts of a current version of macOS installer

The orchestration portion must be written (main.c)