(The iPhone 4S/iPad 2 is perfect. You need to use the newly released absin-win-0.2 prison break tool. In the process of upgrading, the baseband may be upgraded, so please pay attention to save the baseband if there is a lock, and use your own firmware to upgrade and escape from prison. First, download the device firmware corresponding to iOS 5.0.1 and the jailbreak tool Absinthe-win-0.2. (If your device is already iOS 5.0.1, you do not need to download firmware.).)