HT201210 my phone wont sync as it says there is a missing file?

My phone won't sync as it says it has a missing file. I just tried to update the latest operating system to save and update all my iphone data, it said it has incurred an unknown error & I need to restore my phone to original settings.... won't I lose everything if I do that?

Hello hvickers,
Thanks for using Apple Support Communities.
According to the following article, error 29 when restoring from iTunes might be due to a hardware issue.
Resolve specific iTunes update and restore errors
http://support.apple.com/kb/TS3694
Check for hardware issues
Related errors: 1, 3, 10, 11, 12, 13, 14, 16, 20, 21, 23, 26, 27, 28, 29, 34, 35, 36, 37, 40, 1000, 1002, 1004, 1011, 1012, 1014, 1667, or 1669.
Try to restore your iOS device two more times while connected with a cable, computer, and network you know are good. Also, confirm your security software and settings are allowing communication between your device and update servers. If you still see the error message when you update or restore, contact Apple support.
Take care,
Alex H.

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