The AMI BIOS Guard Extractor exists in a complex and ongoing battle between security researchers and firmware protections. These protections are not infallible, and the Extractor is a tool for research and testing.

Contains script commands and size parameters telling the hardware how to parse the update.

Using the AMI BIOS Guard Extractor is relatively straightforward:

AMI Aptio V is the industry-standard UEFI firmware core used by dozens of major OEMs, including ASUS, MSI, Gigabyte, ASRock, Dell, and HP. When an OEM packages an update for an Aptio V system utilizing Intel BIOS Guard, they do not distribute a raw binary file (such as a standard 16MB or 32MB .bin or .rom file).

—the technology underlying Intel BIOS Guard—to extract raw BIOS/UEFI components from protected update images. The Role of BIOS Guard in Modern Systems

The tool reads the header fields to determine where the actual raw firmware begins and exactly how many bytes it spans.

Unplug the PSU. Press the power button. Remove the CMOS battery.