Board Thread:Boruto: Naruto the Movie/@comment-1018594-20150802065156/@comment-1018594-20150802072203

That device allows him to use other Nature Transformations, and he's disqualified from the Chunin Exams for using it. That happens relatively early in the movie, so we don't know for certain whether or not he can use Lightning Release/Chidori by the end of it.