When I try to restore my iPhone 3GS I get an error that says "unknown error (-1)." My iPhone is in recovery mode and I can't use it! PLEASE HELP!

Before this it randomly said "your Phone can no longer send or recieve messages. Please restore to reactivate." Then, instead of restoring it, I restarted it. When I turned it back on it said "activation required." So then I tried to restore it and at the last step "restoring firmware" it freezes and gives me the error code (-1)! After this, it started randomly turning off and plus I couldn't use it at all! I put it in restore mode to try and restore it again and I got the same error message. I tried this on a windows 7 and a macbook with an updated iTunes and got the same error code. I tried it with 2 different sync cords too! What do I do!

Are you running modified software on your phone?  This error seems to be common if the firmware has been modified and you're trying to restore the phone again. 

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