EFI Image File
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What is an EFIRES file?
System file used by Mac laptops and desktops; saved in the Extensible Firmware Interface (EFI) format, an Intel format that defines the interface between the firmware and the operating system.
EFIRES files are used for boot screens, lock screens, login screens, and for the process of updating firmware on a computer system. The files can be found on Macs in locations such as: