want to upgrade my edge evo to a gryphon on my 04 f150
i want to upgrade my evo to a gryphon for my 04 f150 and tried going through the upgrade sheet through the website and it asks me to provide the serial number of the evo and hex but i can not locate the hex code......i want to do some custom tunes on my truck let me know what i need to do to locate my hex code from my evo
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