[問題] iPhone6+ 回去iPhone4S的可能性
iPhone6+ 目前停在IOS 8.2
iPhone4S 則是7.1.2
想要請問 若將iPhone4S更新至IOS 8.4.1
那能否將iPhone6+給備份後回復到iPhone4S上呢?
又或者也把iPhone6+更新至IOS 8.4.1後，兩機互為backup?
這樣可以嗎?
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