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There is no way to hide flashing of the ECM.  No amount of ignition cycles will hide the time stamp.  If the ECM time stamp does not match what ford has, you are busted.  They cant tell what you did to the software, but the know you did something, and that is enough.  When you bought the vehicle, you signed an EULA for the software in the car and agreed you would not modify it.  PERIOD.