{"smallUrl":"https:\/\/www.wikihow.com\/images_en\/thumb\/c\/cb\/Update-iOS-Step-1-Version-2.jpg\/v4-460px-Update-iOS-Step-1-Version-2.jpg","bigUrl":"https:\/\/www.wikihow.com\/images_en\/c\/cb\/Update-iOS-Step-1-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":760,"bigHeight":570}2查看可用空间。(比如8.1或9.1)大很多。100-300MB的空间。{"smallUrl":"https:\/\/www.wikihow.com\/images_en\/thumb\/8\/89\/Update-iOS-Step-3-Version-2.jpg\/v4-460px-Update-iOS-Step-3-Version-2.jpg","bigUrl":"https:\/\/www.wikihow.com\/images_en\/8\/89\/Update-iOS-Step-3-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":760,"bigHeight":570}4连接到无线网络。{"smallUrl":"https:\/\/www.wikihow.com\/images_en\/thumb\/d\/d3\/Update-iOS-Step-5-Version-2.jpg\/v4-460px-Update-iOS-Step-5-Version-2.jpg","bigUrl":"https:\/\/www.wikihow.com\/images_en\/d\/d3\/Update-iOS-Step-5-Version-2.jpg","smallWidth":460,"smallHeight":345,"bigWidth":760,"bigHeight":570}6选择“软件更新”。4设备只能更新到7.1.2。Touch设备只能更新到6.1.6。然后在iTunes程序中重置手机。