This can happen to any one that all of a sudden you encounter some symptoms in the form of error messages in your iPod, forcing you to think for iPod recovery options. All worked fine till the last date and today when you plugged your iPod, this is showing an error message similar to:
"An unknown error occurred (1439)"
Along with this, the error message also states that the iPod is corrupt and is needed to be restored or replugged. During this entire course, the only thing under threat is the data. As per the instructions of the error message, if you try to restore then it would not work. In addition, you can get error messages like:
"iPod could not be restored"
The problem could be the knotty iTunes or some other but not the hardware problem as you can put it into the disk mode. In this condition if you format the iPod then the system may show it filled with the data, although formatting releases the device from all the data.
You can try to update the Tunes. The newer version of iTunes may help you in this regard and probably you may not get this error message in future. But the data which has already got lost due to the former attempts of curing the problem, like formatting, might have rendered the important data out of your access.
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