I want some information about modification and Hack on this firmware

first I don't want to add some other cam to the included smartcard reader
but if it is possible I will be glad to have

But I am interested in source code of the firmware to add compatibility with subtitle for canalsat canal plus france

why did I need to it myself because topfiled didn"t change it for us

the main problem it that the header from canalsat if false
so they didn't give the good page number
and the never specify that they transmit telexte only they give false page number for sub