Jailbroken iphone stuck in recovery loop?

One of my friends at school jailbroke my iphone 3g a long time ago and it was cool until i went to update and restore it. Now its stuck in a endless recovery loop with a screen with a picture of a usb chord below the itunes symbol. I tried going into dfu mode that didn't work. And i'm panicking right now, please help!
ps: i'm know nothing about firmware, hardware or advanced stuff like that. So can you tell me how to fix it the easiest way possible.

Try restoring it itunes, then when it gives you and error and shows the recovery screen, download a program called recboot, it will kick it oit of recovery mode and let you use it.

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