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  • The rolling code is more secure, certainly it was a step-up from the previous system where each fob had a fixed ID and the system shared a synchronised clock.
    I suppose the earlier system having been designed in the 80's-90's used the best technology at the time.

    Unfortunately the Pektron system only partially used the full ability of the Philips chipset, not having the ability to reset the rolling code system
    renders the fobs useless if they lose sync with the SCU and this became a major point of failure.

    Hindsight and all that........ !
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  • The rolling code window is mentioned in several of the MG-Rover documents I have relating to the SCU, but there is
    no consistency with regard to how many operations of the fob will still allow the original barcode to be used, 750, 900 and "around 1000" being mentioned.

    If you are in possession of a fob with its original barcode and "it has only been used a few times" then it is worth trying to program
    it to see if it works.

    The current OE fobs being supplied to the aftermarket and XPart have moved away from the Philips PCF7941 chip and don't suffer the same rolling code sync problems or the corruption from other manufacturers systems. ie. BMW.
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