I currently have a iphone 3g with firmware 3.1.2, i messed up my girlfriends iphone and want to give her my unlocked and jailbroken iphone 3g on 3.1.2, my question is, can i just replace all my info with her last backup? trying to fiquire out the best way to do this , i dont care if i lose all my info i just do not want to restore the iphone inorder to wipe my info out, want to just restore from an old backup i currently have saved on itunes...any help is greatly appreaciated