Cannot restore iPhone 3GS unknown error occurred (40)

I was using my iPhone yesterday and the battery went dead. When I charged it, the iTunes logo with the cable appeared on the screen. I tried connecting my iPhone to my computer via iTunes, then it said that it has detected an iPhone in recovery mode saying that I have to restore it. After clicking OK and restore on itunes, I received an error (40). I've attached a screenshot from it.
My friend gave me this iPhone. I honestly cannot afford your product but I can say that it is the best phone that I had so far. Please help me.
Thanks.

Hello,
I'm interested in your topic, because I have the same problem.
So, I'm wondering if do you solve this ?
Cheers,

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