upgrade ios 4.3.1 to 4.3.3 in software unlock iphone 3gs
 

Hi, my name is hossain..
i use iphone 3GS, ios 4.3.1
i got untrasnow installed in cydia, that means its software unlock..
how can i upgrade my ios to 4.3.3 ???
how to upgrade a factory unlock iphone ios after apple server blocked updating.. i mean it shows server cannot be found, or something.. like now ios 5 is blocked in apple server as ios 5.0.1 is released . how can i restore ios 5 now..

please help me.