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The BIOS may be "manually" updated by a user, using a small utility program.In contrast, firmware in storage devices (harddisks, DVD drives, flash storage) rarely gets updated, even when flash (rather than ROM) storage is used for the firmware; there are no standardized mechanisms for detecting or updating firmware versions.
Sometimes, third parties create an unofficial new or modified ("aftermarket") version of firmware to provide new features or to unlock hidden functionality; this is referred to as custom firmware.
It existed on the boundary between hardware and software; thus the name "firmware".
Over time, popular usage extended the word "firmware" to denote any computer program that is tightly linked to hardware, including processor machine instructions for BIOS, bootstrap loaders, or the control systems for simple electronic devices such as a microwave oven, remote control, or computer peripheral.
Most computer peripherals are themselves special-purpose computers.
Devices such as printers, scanners, cameras, and USB flash drives have internally stored firmware; some devices may also permit field upgrading of their firmware.