Think you will, likely, have to contact Hyundai about that - not sure anyone here has heard about that happening.
Unfortunately it seems, at least in AU, that Hyundai likes to keep all updates to head-units and/or navigation units to itself - i.e. you have to go to a service centre (and then it depends on if they know or will look to see if there are ones for your unit). So it is hard to know if they have released an update - except if people note the software version on their unit changed during a service and/or note functionality changes and/or it is listed on service invoice.
If it is an non-navigation headunit - they are, apparently, designed, etc. by cartronics - they might know something... but no idea if they would welcome contact about them.