In most cases, users get a prompt of iPhone error 9 while updating the firmware or restoring iPhone via iTunes. With this error, update and restoring process will be tampered or restricted. If you happen to encounter the particular error, you are supposed to seek a sure-fire solution to eliminate the problem. However, there are so many factors behind this error that it is hard to know exactly why it occurred. Maybe iPhone network settings are crashed or there is a conflict between history data and existing data. It is even possible that iPhone system issues result in this error. At any rate, you can know 5 methods from this tutorial to get out of the fix.