This document provides instructions for upgrading the firmware on Edimax router models. It explains that the firmware is software embedded in the router that can be upgraded through the router's web interface. The steps include downloading the latest firmware file from the Edimax website, browsing to select the file from your computer, and applying the upgrade which reboots the router automatically. Users are advised to upgrade only when needed and not to power off the router during the one minute reboot process after applying the upgrade.