[問題] iphone4 升級7.1 還能降回來嗎?
我的iphone4前幾天從7.0.4降到5.1.1(有5.1.1的SHSH)
然後最近7.1出了 想用看看7.1看看是不是真的變很順
但是又怕升了7.1就降不回來了,到時候用起來如果很頓那就.....
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