1st: Login to your Regular Admin page at http://192.168.15.1 or http://your_router_ip_address
2nd:Now enter the following:
http://192.168.15.1/Update.html
and use username:user with password:tivonpw
3rd:Then Upload the new image file: Download (Read the link on the Left for more info about this...)
4th: It should be now available to you!