Install firmware on TG582N

Can I install firmware on router Techinicolor tg582n (with usb port) to use it with another provider?
Are there suggestions ?

See https://openwrt.org/toh/thomson/tg582n

Please mind the restrictions regarding DSL modem (not supported) and 2.4GHz wifi (only partly supported).

Do you know generic firmware which supports DSL modem?