3G in Recovery Mode, cannot restore error 1015

i bought iphone 3g off ebay , it's stuck in recovery. when try restore, gives me error 1015. have no idea firmware has or anything. use mac snow leopard. can do?

 

http://www.google.com/search?q=iphone+1015+error&ie=utf-8&oe=utf-8&hl=en&client=safari

 

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