HT201210 while updateing my ios i have occured an error (3004) so tell me what can i do?

hello
       i am using i4s mobile and my current ios is 6.1.3 when i updateing my ios to ios7 it is showing me an error (3004)
       so i hope you can guide me to over this error

From the article that the question was posted from:
Network connection or download errors
Errors 3000-3999 (3004, 3013, 3018, 3164, 3194, and so on): Error codes in the 3000 range generally mean that iTunes can't contact the update server (gs.apple.com)  on ports 80 or 443.
Update to the latest version of iTunes.
Verify the computer's date and time are accurate.
Check that your security or firewall software isn't interfering with ports 80 or 443 or with the server gs.apple.com.
Follow these steps to troubleshoot security software. Often, uninstalling third-party security software will resolve these errors.
An entry in your hosts file may be redirecting requests to gs.apple.com (go to "Unable to contact the iOS software update server gs.apple.com" above).
Internet proxy settings can cause this issue. If you're using a proxy, try again without using a proxy.
Test restoring while connected to a known-good network.
Error 3002: If you experience this error while updating an iPod touch (2nd generation) or iPhone 3G, please use the standard update or restore process in iTunes (click Update or Restore).
Error 3194: You may not have the latest version of iTunes installed. Update to the latest version of iTunes. If the issue persists, follow the steps above in "Unable to contact the iOS software update server gs.apple.com."
Error 3004: If you're using a Mac, you may be able to resolve an error 3004 by quitting iTunes and using the following command in the command line: dscacheutil -flushcache.

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