HT201251: Authorize your computer in iTunes
Learn about Authorize your computer in iTunes
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Helpful answers
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Nov 16, 2015 2:17 PM in response to txwaym1by Allan Eckert,★HelpfulIf your iPhone is in recovery mode, the data is gone already.
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Nov 16, 2015 2:17 PM in response to txwaym1by ChrisJ4203,★HelpfulError -1 is usually a hardware error. You can check out this support document for other troubleshooting steps. Get help with iOS update and restore errors - Apple Support
If you have not done a backup of the device, and it is failing an update and is Recovery Mode, then the data is already lost. You would have to use the last backup that you have of the device. If you have not backed up in a while, now is not the time to backup. You should have done that before this problem occurred.