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High Sierra firmware updates outside of the OS installer.app
Procedure followed by Pepijn to run the high sierra firmware installer:
1. get the FirmwareUpdate.pkg file from the OS installer app's installESD.dmg
2. extract the contents using pkgutil --expand /path/to/FirmwareUpdate.pkg <path somewhere else>/FirmwareUpdate
3. in terminal, cd to the Scripts directory inside the expanded FirmwareUpdate pkg directory.
4. with Scripts as your working directory, run these 2 commands, then reboot:
sudo /usr/libexec/FirmwareUpdateLauncher -p "$PWD/Tools"
sudo /usr/libexec/efiupdater -p "$PWD/Tools/EFIPayloads"
5. at the reboot, firmware will be updated if there are any updates to be applied.
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