Brand-new iPhone 4 - The iPhone could not be restored. An unknown error (9)

Got my new 32G iPhone 4 today and managed to restore my old 3Gs data onto it without difficulty. After trying to update it to 4.3 it says The iPhone "iPhone" could not be restored. An unknown error occurred. (9)
On my Macbook Pro AND Windows 7 computer I've tried a different USB slot, a different cord, and updating iTunes to no avail... I even got the official 4.3 and 4.2.1 recoveries from Apple and tried to restore with them. All deliver the same error message. I've seen this topic on various forums and there doesn't seem to be a whole lot of hope, but I'm hoping to be able to resolve this on my own unless it's some sort of hardware issue that's out of my hands entirely.
Any help is appreciated! Thanks.

FROM APPLE:
Error 9: This error occurs when the device unexpectedly drops off of the USB bus and communication stops. This can occur if the device is manually disconnected during the restore process. This issue can be resolved by performing USB isolation troubleshooting, using a different USB dock connector cable, trying another USB port, restoring on another computer, or by eliminating conflicts from third-party security software.
Basic troubleshooting steps.
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