Ipad5.4无故黑屏，一键刷机到20失败，itunes刷机24失败，提示错9

10:23:17.911: <Restore Device 001C14E0>: Restore failed (result = 9)
10:23:17.911: Can't send dump_console command since device is not in recovery mode
10:23:17.911: AMRestorePerformRestoreModeRestoreWithError failed with error: 9
10:23:17.911: Finished RestoreOS Restore Phase: Failed
10:23:17.911: State Machine Dump, status:ERROR - [state:Recovery remaining-cycles:0] -> [state:RestoreOS remaining-cycles:0 (curren
t state)]
10:23:17.911: Changing state from 'Restoring' to 'Error'
10:23:17.911: State is now set to error: AMRestorePerformRestoreModeRestoreWithError failed with error: 9
10:23:17.911: Found AuthInstallRestoreBehavior and selecting behavior based on that.
10:23:17.977: 刷机错误码：9.
10:23:17.978: 刷机错误描述：AMRestorePerformRestoreModeRestoreWithError failed with error: 9
10:23:17.978: 刷机失败!
10:23:17.978: ---------------------------------------------------------------------------------
一般情况下不考虑设备硬件故障，我们给出以下参考意见：
1. 更换原装数据线连接到供电充足的机箱后置USB接口重刷
2. 使用工具箱中的驱动修复工具尝试进行修复后重刷
如果您是检修人员，排除软件问题后，可按照以下方向进行检测：
多为硬盘，请检查硬盘供电，硬盘虚焊
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10:23:17.978: 用时：00小时01分钟