![]() You should be able to check that in Intel Macs running High Sierra and above using eficheck as described below.ĭon’t forget that when you’ve installed macOS to an external disk, that can update its firmware. Your Mac has installed a spurious version of the firmware, such as malware.This often happens if you install a beta-release of macOS, or could happen after service to your Mac. Your Mac has installed a newer version of the firmware.That’s only going to occur for one of two reasons: Sometimes, the mismatch in versions shows that your Mac has a higher version number than expected. That doesn’t apply to macOS installed in virtual machines, though, and merely downloading macOS can’t change the firmware either. The update or install doesn’t have to be to its internal storage, though: when you update or install a newer version of macOS to an external disk, that should also update your Mac’s firmware. This article explains how that can happen, and what you can and can’t do about it.įor many years now, Mac firmware has only been updated when you install or update macOS on that Mac, and the version of firmware installed should match the version of macOS. So you’ve checked the version of firmware in your Mac, either in System Information or using a utility like SilentKnight, and it doesn’t match that expected for that model and version of macOS installed on it.
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