So if I can get the TV supplier to talk with his A/D board supplier they should know exactly what codes are in that board's firmware today.
And hence the TV supplier would have either told his remote control supplier what codes to use, or he took the remote control suppliers set of codes and gave them to the board supplier to use. And to change them, he can have discreet codes specifically added to the firmware and we can update boards to that new firmware and resolve some of the missing discreet codes - all without changing the codes used by the remote control buttons. Is that your understanding how it would work?