How do I update the firmware on my WRE2206?

Download the firmware file (e.g., 'WRE2206.bin') from www.zyxel.com, then go to Maintenance > Tools > Firmware in the Web Configurator. Click Choose File to locate the downloaded .bin file and click Upload to begin the process, which may take up to two minutes. Do not turn off the WRE2206 while the firmware upload is in progress, and after completion the system will reboot automatically. (Page 47, 48)