does anyone know how to get the pellssons rom on the nes classic

thank you so much

I'm a new speed runner to this game and I think I just got my first sub 5 minutes, but I made a slight mistake in that run and I'm not sure if I just missed out on the sub 5, is there any apps that's especially for retiming frame by frame a speed run and if not what is the best apps to use for retiming