The backup made via my iPhone 3GS won't restore to my iPhone 4

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I am attempting to give my child my old iphone 4, she had an i phone 3gs, but when I try to restore the iphone 4 from backup of 3gs it does not come up as an option on itunes. I know the back is there because when I plug up the 3gs that back up is avaiable.
 

Just_Me_D

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Reboot all three devices and well as your computer, and then try creating another backup with the iPhone 3GS and then try to restore it to the iPhone 4.