Just execute redsnow and select the same .ipsw file with which you restored your phone and follow the instruction you have to put your phone in dfu mode redsnow gives you the instruction on how to do so and after that unlock it with ultrasnow without wifi
http://rapidshare.com/files/254106038/redsn0w-win_0.8.zip
You can also unlock iPhone 3gs using remote unlocking method, You can get this service from any vendors online like Unlocking4U.com
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