I'm trying to restore/update my iphone 3gs but I got the error -1 . Does somebody knows what it means and how to fix it?

I update my iphone to the version 5.0 and it was great, but after I got the 5.1 IOS my iphone started to reboot every now and then. It restarted itself a couple of times and keep working fine, and then it happen again until the screen showed the usb cable and the itunes logo. Its on restore mode, so I connect it to itunes but I always got the error -1 just before the update finished. I have been trying to find out what the error -1 means and how to fix it. My iphone have never been unlock or jailbreaked. I hope somebody have some information about error -1. Thanks.

Have you tried here:
iPhone, iPad, iPod touch: Unknown error containing '0xE' when connecting

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