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I don't think that updating your JBBF flash will solve the issue.
First of all, if some of your CAS info doesn't match your car info then the FA (a list with all the option the car has, and a list of the identifiers) is wrong, or from another car. You can easily read your CAS FA with NCS expert with a K/DCAN cable. I suggest that you also read your NFRM FA and compare both of them, also paste the info here.
Did you removed pin 44 from the blue connector of the JBBF?; do this and try to see if the tailgate closes as it should.
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