iPhone Generation :4
Unlocked? (or Part Number): yes. singapore set
Current Firmware : Latest firmware.i os 4.2.1
Current network: (for example Maxis) celcom
iTunes Version : Latest..
PC/MAC : Pc
Jailbreaking software : No JB
Problem Encountered : camera shutter wont open , camera problem
Steps Taken So Far : restore the os 4-5 times.hard reset.
Screenshot of Problem(if applicable) :
Other Information/Remarks : my iphone 4 camera cant open / camera problem/ hang after i upgrade to os4.2 last week.May i know its a hardware or software problem? any iphone master can help me to fix ? then i try to downgrade to os 4.1 also fail. its posible downgrade to os4.1?

This is hardware problem. Just get the new 1 from service centre @ singapore.REMEMBER.Next time must check camera when receive the new iphone 4.