What can I do to restore my Unlocked & Jailbroken iPhone 3g?

I recently got the phone. I tried to erase everything on the phone while it was near death, and I think it died while doing so. It then went into recovery mode. I tried to put it into iTunes to restore it, but that keeps failing too. The phone has a custom firmware, and I have no idea where or how to get the firmware to properly restore the phone to. Any ideas?

Enter DFU Mode. Then use the proper iTunes version ( iTunes 10 should be okay) and select check for update while holding the shift button on your keyboard and install iOS 5.1.1 from osx daily

http://osxdaily.com/2012/05/07/ios-5-1-1-download-links/

Select the proper download there. Then download it, and do what I just said above.
Should work. Don't bother with iOS 6 on a 3G, there's no iOS 6 available for it.

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