So you are trying to sync an iPhone or iPad with iTunes and you are getting the “could not be synced because the sync session failed to finish” error..
Don’t panic! 😉 Make sure your idevice is connected, then go to the top left in the iTunes menu, choose: File > Devices > Transfer Purchases from iDevice(iPad, iPhone etc.).  This should solve the problem…
See also:
sync session failed to finish | Official Apple Support Communities
https://discussions.apple.com/thread/6348693?tstart=0
Jun 9, 2014 – everytime i try to sync my Iphone with itunes, i get this msg “MuNiba’s Iphone could not be sync,sync session failed to finish” what to do??? i try …
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