M9K防火墙升级

bootrom菜单有个选择启动项的选项，根据提示选择即可

或在设备重启前设置备用启动文件

参考 

1.6.4 软件升级失败的处理

2. 设置启动文件类型

在文件控制子菜单下键入<2>，进入设置启动文件类型显示界面。

===============================<File CONTROL>===============================

|Note:the operating device is flash                                        |

|<1> Display All File(s)                                                   |

|<2> Set Image File type                                                   |

|<3> Set Bin File type                                                     |

|<4> Delete File                                                           |

|<0> Exit To Main Menu                                                     |

============================================================================

Enter your choice(0-4):2

 'M' = MAIN      'B' = BACKUP              'N/A' = NOT ASSIGNED

============================================================================

|NO. Size(B)   Time                 Type   Name                            |

|1   119947264 Feb/27/2013 15:08:22 N/A    flash:/M9000.ipe                |

|0   Exit                                                                  |

============================================================================

输入文件的编号选择待设置的启动文件，这里以选择编号为1的文件为例，键入数字1，终端显示信息如下：

Enter file No.:1

Modify the file attribute:

============================================================================

|<1>+Main                                                                  |

|<2>+Backup                                                                |

|<0> Exit                                                                  |

============================================================================

Enter your choice(0-2):

输入文件类型的编号选择待设置的类型，这里设置为main属性为例，键入数字1，终端显示信息如下：

Enter your choice(0-2):1

This operation may take several minutes. Please wait....

Image file M9000-CMW710-BOOT-E9120.bin is self-decompressing...

Saving file flash:/M9000-CMW710-BOOT-E9120.bin .............................

......................Done.

Image file M9000-CMW710-SYSTEM-E9120.bin is self-decompressing...

Saving file flash:/M9000-CMW710-SYSTEM-E9120.bin ...........................

............................................................................

............................................................................

............................................................................

.....................................................................Done.

Set the file attribute success!

升级版本说明手册最后有讲到如何进入bootware界面升级的，回退和升级差不多，区别在于升级是指定下次启动文件为新版本的软件包，然后重启；回退则是将下次启动版本指定为旧版本，然后重启即可。

如果还是担心，在变更前指定备启动文件为旧版本。