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Here are few links which may help you....
1. redmondpie.com/how-to-unlock-any-jailbroken-iphone-on-any-baseband-and-firmware/
2. youtube.com/watch?v=6yOqa9QLhT0
3. youtube.com/watch?v=o7PCp7tIOVg
Try this :-
1. Plug phone in
2. Go to Device manager >Unversal Serial Bus Con>DELETE Apple Mobile USB driver
3. Uninstall Itunes completely( Dont repair )
4. Unplug Phone and Reinstall ITunes
5. Plug Phone back in and it should show up!