Can't Restore Or Update iPhone 3G

i Downgraded The iPhone to 3.2.1 because it was so slow and now i want to restore it to 4.2.1 again but i keeps getting this error
btw i didn't jb or sth else!
is there anyway to fix it or it's f'd up?!

Personally, I would keep it at 3.2.1 due to performance issues
When you have the phone plugged in to iTunes, are you clicking "restore" or "check for update"?
You can also try downloading the firmware: http://appldnld.apple.com/iPhone4/061-9853.20101122.Vfgt5/iPhone1,2_4.2.1_8C148_ Restore.ipsw
then hold down the option key on your mac keyboard while you press restore, then navigate to the file you downloaded.

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