Jailbroken Iphone 3G 1015 error question....

Hi I need help, I have a 3G Iphone which I had jailbroken few years back. It was becoming slow....I decided to factory defaults...then it got stuck on Apple screen. I tried restoring it with Itune and getting error 1015... I tried both Ireb and Redsnow to get me out but still getting 1015 error. My problem is that I don't have the custom firmware (don't have the computer anymore) yes I know.....anybody can help me ? Thanks

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