Many iTunes users encounter one of the most common problems with iTunes – error 39 with the message “Unable to sync iPhone (iPad/iPod). An unknown error has occurred (-39).
How does this unknown error occur? The iTunes 39 error usually occurs when syncing or restoring an iPhone iPad iPod using iTunes. Many Apple users suffer from iTunes Error 39, especially when trying to delete photos or videos from their iOS devices or download photos or videos from the iTunes library to their iOS devices.