I've searched and found a reference saying that you can disable the startup 3 chimes by changing this:
720-02-03 XXXX X2XX
My wife's 2017 Ford Expedition Limited has the following:
720-01-02 240B 1069
but if I change it to:
720-01-02 240B 1269
then the write fails with an "incompatible"...
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