当我更新到 iOS 4.2 时越狱我的 iPhone 是否有任何问题？
我需要澄清一件事。我有一部运行 iOS 4.0 的越狱 iPhone，我需要将其更新到 iOS 4.2。更新到iOS 4.2后越狱会出现问题吗？
任何建议将不胜感激。
I need to clarify one thing. I have a jailbroken iPhone running iOS 4.0, and I need to update it to iOS 4.2. Will there be any problems with jailbreaking when I update to iOS 4.2?
Any suggestions will be very much appreciated.
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升级到新版本的 iOS 将删除现有的越狱。所以，是的，如果您将 iPhone 从 iOS 4.0 更新到 iOS 4.2，它将不会越狱。
完成更新后，如果您选择的话，您将需要再次越狱手机。 iOS 4.2 有可用的越狱，但我个人还没有尝试过。 （当苹果允许第三方应用程序时，我就不再越狱我的手机了。）你必须自己找到它们，因为我认为这种类型的内容不属于 Stack Overflow。如果你无法使用 Google 找到手机，那么你一开始就没有必要越狱你的手机。
另外，您似乎将 iOS 与 SDK 混淆了。 SDK是Apple向开发者提供的软件开发工具包。不同版本的iOS对应有不同版本的SDK，但iPhone（或iPad/iPod）实际上并不运行该SDK。它运行名为 iOS 的软件；作为开发人员，您可以安装并使用 SDK 在 Macintosh 上编写 iOS 应用程序。
因此，越狱SDK没有任何意义。您越狱的是移动设备上运行的操作系统（iOS）。
Upgrading to a new version of iOS will remove an existing jailbreak. So yes, if you update your iPhone from iOS 4.0 to iOS 4.2, it will be un-jailbroken.
After you complete the update, you will need to jailbreak the phone again, if you so choose. There are jailbreaks available for iOS 4.2, but I haven't tried any of them personally. (I stopped jailbreaking my phone when Apple allowed third-party apps.) You're on your own to find them because I don't think that type of content belongs on Stack Overflow. If you can't find one using Google, you have no business jailbreaking your phone in the first place.
Also, you seem to be confusing iOS with the SDK. An SDK is a Software Development Kit, which is provided by Apple to developers. There are different versions of the SDK corresponding to the different versions of iOS, but the iPhone (or iPad/iPod) does not actually run the SDK. It runs the software called iOS; you as the developer install and use the SDK to write iOS applications on your Macintosh.
Therefore, it doesn't make any sense to jailbreak the SDK. What you jailbreak is the operating system (iOS) running on your mobile device.