Can someone tell me how to get my baseband and firmware back on my iphone 4?

i bought an used iphone 4 but it was stuck on recovery mode, i can get it out of it but it wont show baseband or firmware. and because of it no network will work. no wifi no carrier no bluetooth.

Take a look at this link, http://osxdaily.com/2010/06/24/iphone-dfu-mode-explained-and-how-to-enter-dfu-mo de-on-your-iphone/

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