![]() To help prevent rollback attacks, updates must always have a version newer than the existing one. UEFI firmware updates are digitally signed by Apple and verified by the firmware before updating the storage. The UEFI firmware was the first code to execute on the Intel chip.įor an Intel-based Mac without the Apple T2 Security Chip, the root of trust for the UEFI firmware is the chip where the firmware is stored. This section refers to the Intel firmware as the UEFI firmware. ![]() EDK2-based code conforms to the Unified Extensible Firmware Interface (UEFI) specification. Since 2006, Mac computers with an Intel-based CPU use an Intel firmware based on the Extensible Firmware Interface (EFI) Development Kit (EDK) version 1 or version 2.
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