Disconnect iphone 4 while DOWNLOADING ios 6.1.3 update?

Hi can I disconnect my iphone 4 while downloading ONLY the ios 6.1.3 update? If i disconnect it, and when I connect it again, will it resume the download or go back to start?

The download is not dependent on the phone being connected so removing the phone will do you no harm the download will resume without the phone, next to you plug in the phone and select update it will begin the update from the already downloaded update.

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