HT201210 I am unable to update my IPhone 4 to the IOS 6.  I managed to back up and transfer  and then when it asked to update I said yes and the sync process starte, left it overnight and it came up with an error if continue you will loose all your data. 

I am unable to update my IPhone 4 to the IOS 6.  I managed to back up and transfer  and then when it asked to update I said yes and the sync process started, left it overnight and it came up with an error if continue you will loose all your data.  So stopped! Help!

Are you currently on ios 4?  If so that's where the backup comes in.  You'll need to restore your backup once the software is updated.

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