Can I upgrade from iPhone 4 running old iOS7 to iPhone SE running iOS 9 and use iTunes backup restore functionality so that I don't have to reinstall everything?

  • What is your computer's OS version? iOS 9 requires a version of iTunes which does not work with older OSes. – Kent Apr 10 '16 at 22:48
  • AFAIK everything is latest. – jrwren Apr 11 '16 at 13:30

Yes. You can always restore from and older to a newer iOS version, however you can't go from a newer iOS version and restore to an older version.

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