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The 6.0L Predator requires that your truck have a PCM flash of October 2003 or later.
Do I have to go to the dealer and ask him to flash if it is prior to this? Can I read from another truck which has newer flash with the Predator and flash my truck with that one?
We've had reports of it working with some people who's trucks had earlier flashes (one person reports a June flash). However, Diablo Sport only guarantees it will work with October 2003 or later flashes.
You can't flash a Ford truck with another truck's flash using the Predator, at least not at this point. Your Ford dealer should be able to update the computer, there are several TSB's issued calling for updating the PCM's software.