Hi, I'm new, I just buy iPhone with ver 1.0.2 (its unlock any working fine) , then when i using iTunes first time, iTunes said that new firmware is avaliable press ok to upgrade iPhone, i did that soon its complete my iPhone is now LOCK

Please please help me out , what should i do to revert that all.
Again i'm new to iPhone. I used only 2 hours before its LOCK

Any perfect guide that help me out.

Regards

Thanks in Advance