As you now know, Garmin has stated that the 2012 range will never support the iPhone Smartphone link. Because this is not presently [and according to Garmin, never will be] in the 2012 series fw, unless some serious work is done by an outside fw expert, or Garmin changes their mind, that won't change. Actually, catymag did answer your initial question though. You were seeking a way to enable the Smartphone link from the 2013 series in your 2012 series 3590, and you wished to do this by changing your unit's ID to that of a 3597 for that purpose, correct? Caty has told you that's not feasible because the ID is stored in reg 41 [and it's a very bad idea to muck around with that]. She also points out that it is possible to change/enable some features by modding region 140 in some models. But that pre-requires that the feature is supported by the fw anyway and in the case of iPhone link it's not possible presently because it's simply not in the fw for your 3590 to begin with.
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