In the process of iOS 8.1.3-iOS 8.3 jailbreak, if jailbreak failed and error messages appear, you can follow instructions below for the meanings of codes and solutions.
【 -1001 设备断开】
【 -1001 device disconnected】
提示此代码时，证明在越狱过程中设备与电脑之间的联系断开了。请在越狱过程中不要对设备进行任何操作，保持设备连接状态。建议使用正版Apple配件数据线，防止盗版数据线出现断开问题。
It means your iDevice is disconnected from the computer during jailbreak. Don’t do anything on your iDevice during jailbreak and keep it plugged in. Use certified cables.
【 -1002 设备有密码保护】
【 -1002 device with passcode on】
提示此代码时，说明越狱的设备的密码锁没有解开，请到设置->密码中关闭密码，然后在进行越狱操作。
It means passcode on your iDevice is turned on. To turn it off, go to Settings > Passcode.
【 -1003 程序数据被破坏】
【-1003 program data corrupted】
请到太极官网重新下载越狱工具，或者更换稳定的网络环境。
Re-download the jailbreak tool from www.taig.com, and make sure you have a good internet connection.
【-1004越狱失败 分为三种情况】
【-1004 Three conditions of jailbreak failure】
-1103 程序数据被破坏
-1103 program data corrupted
此问题为电脑导致，请更换一台电脑进行越狱操作。卡在 30%，首先检查 pc 和设备上有无后台程序抢占 cpu 资源，pc 上通过任务管理器观察一下即可，设备可以通过重启确认；其次连接设备的 usb 线和 pc 上的 usb 口也是影响因数之一，请尝试换个usb 口接入和 usb 数据线。
It was caused by computer. Please try on another computer. If jailbreak is stuck at 30%, firstly check whether background programs are preempting CPU resources by observing task manager on the computer. You can reboot the device to confirm. Secondly, change USB on the computer and USB cable connecting iDevice and the computer.