Itunes unknown error 1015 when upgrading to latest ios

I have an iphone 3gs (32gb) and I tried to upgrade to ios 4.3.2 but upgrade failed and phone switched to recovery mode.
I haven't been able to restore after trying out all the options from apple's website and the error msg: unknown error 1015 keeps showing up. pls any suggestions??

Hi blessingfrombedford,
Has the iPhone been jailbroken at any point or have you had any developer software on the handset? If so then this could be the cause of the issue.
You can try to remove the IPSW file from the computer (or try a known working PC & Network / Create a new user account on the computer and do it in there as it will re-download the IPSW file) and attempt to restore the device again.
Ensure that you've tried this (it's covered in the link) and the other steps in the following article: http://support.apple.com/kb/ts1275
If the iPhone is still refusing to restore then you're probably best to try and visit a Genius at a local Apple Store (if you have one).
Hope this helps.

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