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[iPhone] iOS17 还可以降级到 iOS15 或 iOS14 吗

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手头有一个备用机 iPhone xR ，好久没用了，忘记什么时候升级到 iOS 17.4.1 ，但是使用明显卡顿，不知是否可以降级到 iOS 15 或 iOS 14 （为了还可以流畅使用）呢？看 ipsw 都是未签名的，请问有什么工具可以降级.

ps:手头在用 xR 的朋友使用的都是哪个 iOS 版本啊

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