An unknown error occurred (-1) when trying to update my iPad to iOS7.

Last night I attempted to update my iPad 2 to iOS7. At some point during the process, the iPad locked up and I was presented with a screen instructing me to plug into iTunes for a system restore. I did so and after approximately 10 minutes, I received the following message, 'The iPad "iPad" could not be restored. An unknown error occurred (-1)'. I have since re-tried about a dozen times to restore and keep ending with the same message. Is this just a case of the servers being overwhelmed? Should I try again in a few days when things calm down? Or has the update killed my iPad? Do I need to take it to the Apple store?
Thanks Apple... Frustration level is off the chart.

I am facing the same issue, have you had luck getting it solved?

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I just got off the phone with an apple support assistant pertaining to error -23. For myself, it is due to internet settings that my ISP provides that prevents the upgrade. (Are you in Singapore with the ISP Singtel? The apple support assistant specifically mentioned Singtel users as having the -23 error.) The apply support assistant adviced me to wait out for 2 business days and then see if I can upgrade. I hope this is the case for you too.
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Hey there ejs11201,
I see that you are getting an error code when attempting to restore your iPhone. Here is an article that addresses that specific code with some troubleshooting steps and will help you resolve the issue:
Check your security software
Related errors: 2, 4, 6, 9, 1611, 9006. Sometimes security software can stop your device from communicating with either the Apple update server or with your device.
Check your security software and settings to make sure that they aren't blocking a connection to the Apple servers.
Get help with iOS update and restore errors - Apple Support
https://support.apple.com/en-gb/TS3694
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Hi lachima,
Welcome to the Apple Support Communities!
I understand that it is frustrating when you are getting an error when trying to download previously purchased content. There are some great troubleshooting steps for this specific situation though. I recommend reading over and using the steps provided in the attached article to help you get this resolved.
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http://support.apple.com/kb/TS1583
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Hi chiekoo,
Thanks for using Apple Support Communities.
For more information on this, take a look at this article:
iTunes: Specific update-and-restore error messages and advanced troubleshooting
http://support.apple.com/kb/ts3694#error21
Error 20, 21, 23, 26, 28, 29, 34, 36, 37, 40
These errors typically occur when security software interferes with the restore and update process. FollowTroubleshooting security software issues to resolve this issue. In rare cases, these errors may be a hardware issue. If the errors persist on another computer, the device may need service.
Also, check your hosts file to verify that it's not blocking iTunes from communicating with the update server. See iTunes: Advanced iTunes Store troubleshooting—follow steps under the heading Blocked by configuration (Mac OS X / Windows) > Rebuild network information > Mac OS X > The hosts file may also be blocking the iTunes Store. If you have software used to perform unauthorized modifications to the iOS device, uninstall this software prior to editing the hosts file to prevent that software from automatically modifying the hosts file again on restart.
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An unknown error occurred (-1) when trying to update my iPad to iOS7.

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