iPhone is considered to be one advanced gadget marketed by Apple Inc. It not only works like a Phone but user can also use it like multimedia, camera phone, internet usage like SMS, contacts, email. Due to this reason user are always in need of iTunes with which they can easily manage and transfer their data to and from iPhone and PC. But many user come across error messages while restoring iPhone data user encounter iTunes restore error 21, this leads to complete halt of restoration process, along with error message in iTunes like “Connect to iTunes” error on the screen of device.

After connecting to iTunes as directed, user might also encounter error message that cannot be get rid of easily. The error message can be as discussed below:
“The iPhone “iPhone” could not be restored. An unknown error occurred.”
But it becomes important to resolve iTunes 21error message in order to transfer or restore the iPhone data. So you can try DFU mode in Mac operating system that has been screwed up in the latest version of Mac. So get in the DFU mode by following below given steps:
However, if the error is not fixed then try to reinstall iTunes to the latest version. With this user will be helpful in resolving the error message and then try to transfer iPhone data. On the other hand user can also try third party iPhone File Transfer Software. This software can easily be used by the novice users; this is of great help to easily transfer the data from iPhone to PC and vice versa.

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