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Yup, that could be too.... missing the voice file....   My maps took about an hour going from 1-18 to 1-19

See my reply in the other thread where you posted the same issue.   https://fordsyncforum.com/index.php?/topic/7350-map-update-error/  

Hello Ldf150king,
  The problem with losing the voice commands may have been caused by removing the USB too soon.  The are a couple of bogus ‘complete’ messages that popup momentarily and the system reboots.  Do not remove the USB until you get the real complete message that stays on the screen until you clear it.   Try rerunning the update. Mine took about an hour to run the whole thing.    

As I'm re reading this ... I posted something to your post about that problem....  could also be a missing file (voice) , maybe re-download the file and unpack it see if there is a missing file... you could try listing them here...   I found that if I unpack each file they reveal what they are for.... (then I delete the new folder cuz it's not needed)

What does it do/not do when attempting to use the Voice Commands?   Did you look to see if there is an OS update?  3.0 or 3.4 ? did you get it from the Ford/Lincoln site?  or 3rd party?  

Several days ago Downloaded and installed the latest Map update (N1.19) for Sync3.  The install was error free but since the update Sync Navigation voice commands are no longer recognized.  All other voice commands still work fine.  Also I’ve only used the navigation system 3 times since the update and all 3 times the map directions were screwed up.  2 times it put me on dead end dirt roads and I could not complete the trips without using google maps on my phone and the 3rd time it mapped out a course 1 hour longer than google maps, mapquest and several other navigation apps I checked out.  So The new Map update is 0 for 3 and a piece of garbage.  My old version worked much better.  Right now I’d just like to at least get voice commands back.  If anyone knows how to fix this please let me know.  Thanks!