The original flash narrowed the voltage band for the signal that said the transfer case was in the proper position. To narrow. Some, most from what I read, actuators sent to low or to high a signal causing the fault code. The latest flash opened the band some more and it works for most. It depends on the extent of the crack, corrosion, or out of spec component of the actuator whether it will work dependably. This could change at any time. Mine has worked for 4 months now and about 3000 miles. I drive through deep water so I am keeping my fingers crossed this does not mess up any connections affecting the signal.
Getting into the software and electronics involved here is something Jeep is never going to let us do.