北京时间5月25日早上，苹果针对iPhoen 4(GSM版)推出了5.1.1 (9B208)更新： 据破解者iH8Sn0w称，苹果刚刚发布了一个针对iPhoen 4(GSM版)的iOS 5.1.1测试更新。
刚刚测试了一下，目前absinthe2.0.1工具不支持9B208固件完美越狱。如下图：
苹果接下来貌似还会有更进一步行动，希望FY们抓紧时间越狱，并且备份好SHSH，祝大家顺利
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越狱之后的一些常见问题
1，添加各种源失败，显示红字。
解决办法：
如果出现bad 404等红字，一般是由于网络问题，服务器挤爆了，导致不能添加，这种情况大家可以换一个时间段添加源，或者使用网速快一点的网络，比如3g，多试几次，就可以添加成功。
出现其它红字，可以试试删除cydia软件源中的不相关源，ZodTTD&MacCiti 这个源可以删掉，因为添加其他源很容易与它产生代码冲突，故可以删除，我一般只留下bigboss源，其余都删除 ，再添加威锋源、数字源。
2，越狱后cydia不能安装插件，显示红字“I wasn‘t able to locate。。。”。
解决办法：这个一般是由于刚打开cydia还未加载完导致，等cydia上方下载完毕，然后关闭cydia重新打开再安装插件即可。
3，装了各种插件，spring之后出现白图标的。
解决办法：很简单，直接打开CYDIA软件包，找到Substrate Safe Mode 点击更改，重新安装，刷新之后白图标即可恢复。
4，越狱后cydia闪退
解决办法：首先请尝试将语言设置为【英文】再打开Cydia，打开【设置】-【通用】-【多语言环境】-【语言】，选择English
用pc端文件编辑工具，比如iFunbox定位到/User/Library，复制Keyboard文件夹，然后定位到/Var/root/Library，粘贴Keyboard文件夹。
重启设备即可。
5，越狱后安装插件出现“HTTP/1.1500 internal server error”错误
解决办法：重启路由器，重启手机，打开cydia安装即可。多试几次。
6，开启 所有ipad、ipod上的时间统计功能，包括显示使用时间、待机时间。
解决办法：用ifile 找到/System/Library/PreferenceBundles/UsageSettings.bundle/ 中的Usage Statistics.plist 编辑删除
requiredCapabilities
三处代码，保存关闭，即可显示电量用量。
7，越狱后安装插件导致通知中心不见。
解决办法：手势插件导致，删除即可。
8，越狱后iphone、ipad不能连接电脑，提示发生了未知错误。
解决办法：这种情况不仅仅发生在越狱后，有时候恢复固件、升级系统都有可能发生，一般是由于usb口供电不足或者驱动问题，台式机可以尝试插在后面的usb接口，或者换个usb等驱动安装完成之后即可。
9，越狱后必装插件推荐，防止安装过多重复插件，导致手机反映慢，电量消耗过快。
解决办法：
手势：quickdo (解放home ，一键关闭后台程序)
归属地：kuaidial(短信显示归属地，拨号快捷)
备份：QQ同步助手(通讯录、短信恢复，恢复固件后必备)
输入法：百度、搜狗都可以用的多，但我比较喜欢讯飞语音，打字快捷，识别准确。iphone5 7.0.4越狱后要不要安装Cydia Substrate这个插件吗？_iphone5吧_百度贴吧
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iphone5 7.0.4越狱后要不要安装Cydia Substrate这个插件吗？收藏
登录百度帐号推荐应用Cydia Substrate
The powerful code modification platform behind Cydia.
Hello! We have just released Substrate for Android, a project that we hope will be as interesting to that community as it has been for the last four years on iOS. However, please understand that our testing has so far only been "internal", and lots of things can go wrong "in the field": keep backups ;P. We encourage interested Android users to join our IRC channel, .
Remix Software
Extensions: the cool alternative to apps!Modify behavior without patches or ROMs.
Substrate makes it easy to modify software, even without the source code, and in a way that allows users to easily choose which changes they want.
Developers support this by building their changes as "substrate extensions" that are loaded into all of the processes they want to take control of.
By using the provided API to make all changes in memory, multiple developers can safely adapt the same parts of the target program to their purposes.
...for iOS
Supported on versions 2.0 through 9.1,including second-generation AppleTV.
To install Substrate, you will need to "jailbreak" your device, as making changes to other software is not something that Apple normally allows.
Depending on your iOS version and device, you will need to use one of a few different jailbreaking tools such as redsn0w or evasi0n.
The various jailbreaking tools install Cydia Installer, which you can then use to install Substrate and any of thousands of Substrate extensions.
...for Android
Supported on versions 2.3 through 4.3,including Kindle Fire, CyanogenMod, and Intel.
While Android itself is "open", the devices that run it often aren't. Before installing Substrate, you will first need to get root access on your device.
Depending on which device you have, and which version of Android,
we therefore can't provide a simple recommendation.
Once you have root, you will need to install our APK, run the application, click Install, and grant Superuser access to Substrate when prompted.}