Updating to iOS 5.1 - Unknown Error (11)

Hi,
I have a 3GS Factory Unlocked running on iOS 4.1.
I went for 5.1 update for the device but it stopped with the following error message:
"The iPhone could not be updated. An unknown error occured (11)."
On clicking more information tab in the error message was directed to the following page:
http://support.apple.com/kb/TS1275
I had updated my iTunes to 10.6 prior to connecting the device. In DFU Mode, got the following message on connecting to iTunes;
"iTunes has detected an iPhone in recovery mode. You must restore this iPhone before it can be used with iTunes."
Got out of DFU Mode & the device rebooted to normal. On again updating the device got the same error message.
Pls assist resolving the issue.

Thanks neukyhm for your reply.
As stated earlier, I exited DFU Mode & the device has rebooted to its normal self.
My main problem is that, I am unable to update the device to 5.1.
Getting the unknown error (11) message again on updating.

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http://support.apple.com/en-us/HT201263
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