I wish to update my ipad 2 from ios 4.3.3 to ios 7, when i want to restore back, it occurs error 3004. How?

I wish to update my ipad 2 from ios 4.3.3 to ios 7, i follow all the steps and until the end, when i want to restore back, it occurs error 3004. How? and now i can't even use my ipad at all, it's empty.

Resolve communication issues
Related errors: 17, 1004, 1013, 1638, 3014, 3194, 3000, 3002, 3004, 3013, 3014, 3015, 3194, or 3200. These alerts refer to gs.apple.com, say "There was a problem downloading the software," or say the "device isn't eligible for the requested build."
Check the hosts file or TCP/IP filtering, which might cause communication issues between iTunes, ports, and servers.

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