The NextLight U4 WiFi Router Starter Guide is a bilingual (English and Spanish) resource that walks residential customers through the process of connecting their U4 WiFi Router to an existing Optical Network Terminal (ONT). The guide provides clear instructions for linking the router via Ethernet, powering the device, and identifying the solid green status light that signals a successful connection. Additionally, it explains how to locate default WiFi credentials (SSID and WPA-Key) for initial setup and highlights the NextLight WiFi app for easy network management. To ensure a smooth installation, the manual also includes a QR code for a video tutorial and access to online self-install resources.