I did, erased the signal from the drive, destroyed the drive, checked the saved signals on the pc to make sure isnt there either but still got the ending. I saw someone on reddit saying that once you process the signal to lvl 3 there is no going back no matter what you do so wanted to double check by asking here.
Edit: I actually tried doing it again and this time I did get the message saying ''G O O D'' wich means I avoided the ending. I dont really know what I missed the first time but yeah, procress lvl doesnt matter, saying in case anyone with the same problem/doubt ends here.