From what I've gathered, EFILive cannot, nor any other aftermarket tuners, flash a complete file to a brand new ECM. That is what the magical 'Tech 2' Scanner must do.
What are some of the areas that don't get updated or installed with tun & ctd files? I've seen stuff like ETC [electric throttle control] CPU & pin outputs get set and not changed, but wondering how much deeper it goes.
Why can't an OS go backwards compatible if the internals of the ECM are the same? Something must not be getting erased.
Thanks!