Iphone 3g at first is disable but after i use my macbook air to update and restore now totally cannot on, iphone 3g at first is disable but after i use my macbook air to update and restore now totally cannot on

Hi,
I have a iphone 3G, at first is disable due to my nephew keep guessing the password, after i use my macbook air to restore & download now totally cannot on.
May i know what can i do now?

Step 1
Reset the System Management Controller.
Step 2
If there's no change after Step 1, reinstall the OS. Back up all data first.

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