Cisco Support Community
Firmware upgrade is generally made on the router if the router has been experiencing problems or to get a new feature in a particular firmware. This document explains how to perform a firmware upgrade on the WRV54G Wireless-G Gigabit Router.
Software Download URL
Step 1. Use the Router Configuration Utility to choose Administration > Firmware Upgrade.
Step 2. Click Choose File to find the firmware upgrade file that you downloaded from the website and then extracted.
Step 3. Click the Upgrade button once the file has been selected and follow further instructions.