I think not I am the only one who wanted to use the Thomson modem with an own router. Unfortunately SMART restricted the firmware with a 2nd level password.
To use your Thomson TG585V7 in bridge mode the solution is here:
Download generic firmware from here:
If you have the downloaded it, extract it for example c:\temp\firmware.bli
Download a TFTP server from here:
Enable the TFTP root for c:\temp in the configuration file
Download a bootp server from here:
After installed bootp server go to configurations and add your routers MAC address to the list (where is 11-11-11... and 22-22-22....). You can find routers mac address on the box. Add two options, IP address should be with value 192.168.1.254, and Boot file with value: /firmware.bli
Set a fix IP address for your Ethernet card (DO IT ONLY VIA ETHERNET, FORGET WIFI FOR FIRMWARE UPGRADE!!!), for example 192.168.1.60.
Remove telephone line from your router and press reset button (wait long) until power led goes to amber (green->red->amber). If everything is fine, your router will reboot itself after 1-2 minutes with a brand new generic firmware without any password. DO NOT RESET THE ROUTER, WAIT UNTIL IT REBOOTS ITSELF!!!
If you are done, enter in the browser: http://192.168.1.254/ewizard.htm, and select bridge mode. After router is in bridge mode, you can reach it via 192.168.1.254, but it will allow through PPPoE as well.
That's all! Good luck!
One more comment, I suggest to start TFTP server in stand alone mode to see what happens. For me first time when router started to download the firmware, the TFTP ran into time out. I changed time out to 255, and decreased block size to 512 in the configuration file.
OF COURSE, BE AWARE, IF YOU DO THIS, YOU WILL LOOSE SUPPORT FROM SMART SIDE, AT LEAST MODEM CONFIGURATION SUPPORT!