Error restore while updating to iOS 4

please help/ .
i Have a iPhone 3G (Unlocked).
I'm Trying to update it to iOS 4.
When restore process, it paused in the 20% of progress bar. .
I have tried many times. and always paused at the same progress(20%).
I unplugged the cable, and reset my iPhone, then do the same process again.
Some times , there was an error message with code: (14)(but. . this is only sometimes)
is it wrong with the firmware or my iPhone or with USB?
Any idea?
Now, i'm trying to download again the ipsw.
really2 need help. .

Please anyone who can help this crazy problem!..

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