Some advanced versions also:

The AMI PFAT structure does not usually dictate a specific linear order for its components. Merging Files is Often Useless:

If you want to modify the BIOS (to add NVMe support to an old board, change logos, or tweak hidden settings), you can't open the file directly if it's protected by BIOS Guard.

BIOS Guard acts as a hardware-rooted gatekeeper for the system firmware. It utilizes an isolated execution environment inside the CPU (via SMM, or System Management Mode) to verify the digital signature of any incoming BIOS update before it physically writes to the SPI flash memory chip. The Encryption & Capsule Problem

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