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2、裏面有壹個通用的選項，選擇進入。
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3、下壹步找到軟件更新，進行點擊。
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4、這個時候來到壹個新的界面，已下載就選擇現在安裝。
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5、如果沒問題的話，安裝頁面會通知正在驗證。
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6、等提示更新已完成以後，即可升級ios系統了。
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