iTunes Error 9006 - How to Fix Itunes Error 9006 When Updating or Restoring iPhone or iPad While restoring or updating my iPhone or iPad, I have encountered iTunes error 9006 quite a few times. The error message reads like “There was a problem downloading software for the iPhone. “An unknown error occurred (9006).” “error 9006”. Luckily, it’s not a big task to fix iTunes error 9006. If