TS3694 how will i turn on my iphone3g?

i updated my iphone 3g (4.2.1)now it needs to be restored in the itunes but it said iphone could not be restored error 1015 now i cant open my iphone3g...i cant used it anymore.

Here is what Apple has to say about error 1015:
Error 1015: This error is typically caused by attempts to downgrade the iPhone, iPad, or iPod touch's software. This can occur when you attempt to restore using an older .ipsw file. Downgrading to a previous version is not supported. To resolve this issue, attempt to restore with the latest iPhone, iPad, or iPod touch software available from Apple. This error can also occur when an unauthorized modification of the iOS has occurred and you are now trying to restore to an authorized, default state.

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