升级失败提示 Download Fail:Switch To EDL FailFailed to Switch to Emergency Download mode

Start Download
COM Port number:5
Switch To EDL
Download Fail:Switch To EDL FailFailed to Switch to Emergency Download mode
Finish Download

要么没开机，要么需要 重启 设备（拔掉电池 再插上电池）

线刷简单说明

• 安装升级软件QFIL： 解压QPST.WIN.2.7 Installer-00448.3.rar - 安装 QPST.2.7.448.msi
• 安装驱动：qud.win.1.1_installer_10061.1.zip
• QFIL设置，设置 Configuration - Download Configuration- Reset After Download项“√”，表示 升级完成后对设备会自动重启。
  
• 设备上电
• 点击 Select port,显示当前端口，表示和设备连接上
• 选中Flat Build选项
• 点击 Browse 选择升级文件夹（.mbn文件）
• 点击 Load XML 选择升级文件（2个.xml文件）
• 点击 Download 进行升级，当显示出 Download Succeed升级成功。

Start Download
COM Port number:5
Switch To EDL
Program Path:D:\xxxx_xxxx_user_nopoc_xxxx\xxxx_xxxx_user_nopoc_xxxx\prog_emmc_firehose_8909_ddr.mbn
***** Working Folder:C:\Users\Administrator\AppData\Roaming\Qualcomm\QFIL\COMPORT_33
Binary build date: Jul 27 2016 @ 02:08:50
QSAHARASERVER CALLED LIKE THIS: 'D:\Program Files (x86)\Qualcomm\QPST\bin\QSaharaServer.ex'Current working dir: C:\Users\Administrator\AppData\Roaming\Qualcomm\QFIL\COMPORT_33
Sahara mappings:
。。。。。。
15:12:19: INFO: Current working dir (cwd): C:\Users\Administrator\AppData\Roaming\Qualcomm\QFIL\COMPORT_33\
15:12:19: INFO: Showing network mappings to allow debugging
。。。。。。
15:13:09: INFO: ==============================================================
15:13:09: INFO: Files used and their paths
15:13:09: INFO:   1 'C:\Users\Administrator\AppData\Roaming\Qualcomm\QFIL\COMPORT_33\port_trace.txt'
15:13:09: INFO:      _             (done)
15:13:09: INFO:     | |                 
15:13:09: INFO:   __| | ___  _ __   ___ 
15:13:09: INFO:  / _` |/ _ \| '_ \ / _ \
15:13:09: INFO: | (_| | (_) | | | |  __/
15:13:09: INFO:  \__,_|\___/|_| |_|\___|
15:13:09: INFO: {All Finished Successfully}
15:13:09: INFO: FILE ACCESS SLOW!!     0.00 B in  0.015 seconds (    0.00 Bps) --- Overall to target  0.078 seconds (0.00 Bps)
Writing log to 'C:\Users\Administrator\AppData\Roaming\Qualcomm\QFIL\COMPORT_33\port_trace.txt', might take a minute
Log is 'C:\Users\Administrator\AppData\Roaming\Qualcomm\QFIL\COMPORT_33\port_trace.txt'
Waiting for reset done...
Download Succeed
Finish Download