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You already have the current file that Henk has listed. Maybe drop him an email and ask if there's an updated file for your car that he may not have on the website?
However (maybe I'm looking at this completely wrong) I would have thought the 6500_xxxx.rst would be more up to date due to it being a higher number than 6400_xxxx.rst.
So would swapping the 6500_xxx.rst to a 6400_xxxx.rst in effect be "down grading" the ECU? Or does it not make any difference and the 6*00 is just a reference number to make the software easier to use?
Yes and No. 6500 is a newer software version than 6400. BUT 6400_2a07.rst is the GRP_N map. So its a totally different kettle of fish. the 6400 modified map is a better variant than any standard map renault have produced. So dont look at it as downgrading Basically ignore the numbers in this instance as it means nothing in relative terms to remapping you car.