iTunes provides Apple users with a lot of great functionality, like updating iPhone software, restoring iPhone, backing up data, transferring and syncing files, etc. However, it doesn't work well all the time. Sometimes, users will be confronted with various iTunes errors, for one, iTunes error 9006 could occur when updating iPhone software with iTunes. Frankly, this iTunes error is not a knotty problem. Many ways can contribute to fixing it. In this article, 6 most effective solutions are expounded.