iphone 3gs 4.3.3 modem 05.16.02 unlocking

Hi,i poverty to unlock iphone 3gs s/w ver 4.3.3 and modem code 05.16.02....i hit tryed to establish ipod modem edition but every in vain.......also i hit tryed to downgrade it to 4.1 or 4.2.1 with custom code in DFU mode....but effort nonachievement "iphone 3gs cannot change nonachievement 3194"...So crapper embody pass me how i crapper unlock it.thanks

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