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Tomato is a family of community-developed, custom firmware for consumer-grade computer networking routers and gateways powered by Broadcom chipsets.The firmware has been continually forked and modded by multiple individuals and organizations, with the most up-to-date fork provided by the FreshTomato project.
Firmware hacks usually take advantage of the firmware update facility on many devices to install or run themselves. Some, however, must resort to exploits to run, because the manufacturer has attempted to lock the hardware to stop it from running unlicensed code. Most firmware hacks are free software.
This is an especially big concern for embedded devices, in which upgrades are typically all-or-nothing (the upgrade is a firmware or filesystem image, which isn't usable if it's only partially written), and which have limited ability to recover from a failed upgrade. [5]