my apple iphone 3g.unlock iphone,i need you help me how to back normal ios

Sorry, but your post is unclear. I don't know what you mean by "back to normal iOS". Do you mean that you jailbroke your iPhone? If that's what you mean and you now wish to remove the jailbreak, you can try putting the iPhone into DFU mode and see if that will let you restore and remove the jailbreak:

http://osxdaily.com/2010/06/24/iphone-dfu-mode-explained-and-how-to-enter-dfu-mo de-on-your-iphone/

Some jailbreaks cannot be removed and in some cases will permanently disable your iPhone. If that happens to you, then you will have to buy a new iPhone; Apple will provide no support, warranty or out-of-warranty, for a jailbroken iPhone. You're on your own from here. We can provide no further help with a jailbroken iPhone in these forums.

If that's not what you mean, please post back and clarify. You may wish to try posting in your native language so that your question is more clear.

Regards.