Any 1 can please help me on this? i'm using iphone 3g maxis set, already jailbreak.

when i use itunes 8.2.0.23, trying to update to O.S 3, got an message " A new iPhone software version 3.0 is available, but requires iTunes 8.2. Would you like to download iTunes 8.2 now?"

i try downloaded os 3 from others thread, but i can't install.. i hold shift & click on restore button, didn't see any place can let me select the ipsw files.. i hold shift + click on update also same...

any 1 can give me a hand please..