Unlocking problems with 3g 4.2.1

Hi guys, i have problem with jailbreaking my iphone 3g 4.2.1.I did jailbreak and i downloaded ultrasn0w from cydia but when i entered in carier section i got message ''unable to load network list''.I dont know what is problem, is it myb because i didnt download manualy ipsw (i downloaded it via itunes)?If anyone have any ideas pls help. Thanks

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