Huh? As far as I know every Intel ME has access to the internet, can receive push firmware updates and write access to everything else on the system. It does not need a modified version, they can just use the official way, the normal Intel ME on target devices, if they can cloack their access of the official server, which I think could be achieved of using just the key of the official server and then use another server posing as the official server.
But it has been a while that I read about it and I never took it apart myself, so maybe what I wrote is not possible for technical reasons.
But it has been a while that I read about it and I never took it apart myself, so maybe what I wrote is not possible for technical reasons.