BootROM (Boot Read-Only Memory) is a hardware component, typically a non-volatile memory chip, that stores the initial code required to start a device’s boot process. When a device powers on, the processor executes instructions from the BootROM to initialize hardware components and load the primary bootloader or operating system. Because BootROM is read-only, its contents cannot be altered, making it a critical security boundary. Attackers who compromise BootROM can gain persistent, low-level control of a device, but modifying BootROM is usually extremely difficult. Secure Boot implementations often rely on trusted BootROM code to verify system integrity.