Flashing Thomson SpeedTouch 546i.

I flashed my router (Thomson SpeedTouch 546i) today. Downloaded a UK-version, that I were not sure would match. But after some trouble back and forth, I managed to flash to the latest version for that model. I am thinking about contacting my ISP to make them push firmware updates to their customers. Since today they only ship outdated models. And I am not even sure if I am allowed to flash it Lets just hope so. One feature I miss with SpeedTouch is to configurate the DNS server. I am quite fond of OpenDNS, and their services.