![]() This controls many of the extended hardware features like cooling fans. ![]() In Macs without a T2 chip, the SMC is a custom chipset with its own firmware which may sometimes be updated separately from the EFI. here for Sierra, High Sierra and Mojave,.Lists of firmware versions for different versions of macOS, and further help, are: To understand it better, read this guide. These include the EFI firmware, the SMC, NVRAM and (in certain models) the T2 chip.ĮFI firmware is specific to the model of Mac, and may differ according to which version of macOS you have installed. But in order to boot it up sufficiently to be able to load that up, and to enable certain hardware features controlling the cooling fans, battery charging, etc., every Mac has firmware and persistent storage for some key settings. Most of your Mac is operated by software which is loaded from your startup volume.
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