Sometimes an unofficial new or modified version of firmware is 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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