A apple logo appears on screen of apple 3g i dnt knw how to restore iphone

a apple logo appears on screen of 3g i dnt knw how to restore iphone i also want to update its ios can i do it?

Hi sidrasarwar!
I have an article here that can tell you how to restore your iOS software:
iTunes: Restoring iOS software
http://support.apple.com/kb/HT1414
Restoring your software will also check for any available iOS updates. Take care, and thanks for visiting the Apple Support Communities.
-Braden

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