created by third parties to provide new features or unlock hidden
functionality. Examples include Rockbox for digital audio players,
CHDK for Canon digital cameras, and OpenWRT for wireless routers, as
well as many homebrew projects for gaming consoles. These can often
unlock general purpose computing functionality in previously limited
devices (e.g., running Doom on iPods). Most firmware hacks are free
and open source software as well.
These hacks usually take advantage of the firmware update facility on
many devices to install or run themselves. Some, however, must resort
to exploits in order to run, because the manufacturer has attempted to
lock the hardware to stop it from running unlicensed code.
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