This document provides an overview of how to hack into a city's Wi-Fi network by embedding a device into routers. It discusses the architecture and tools needed, including the operation system (Linux or VxWorks), hardware components like the system on chip and flash memory, and firmware structure. It also describes tools for analyzing and modifying firmware, like Binwalk and Reaver, which can exploit vulnerabilities in WPS to hack Wi-Fi passwords. The document concludes with links to additional online materials and a demo.