一、前言

部分局点使用的是H3C V5无线控制器，无法升级V7版本，但现场AP损坏，更换的AP备件都为V7版本，需要对AP进行软件降级，我们可以先将其他V5版本AP设备的bin文件拷贝出来，然后通过该文件进行AP降级，下面的流程以H3C WA4320-ACN-C-FIT设备为例。

二、设备版本降级

总体步骤如下：

1、进入V7版本BootWare 按Ctrl+F格式化Flash；
2、进入V7版本BootWare，通过网卡口，导入V5版本APbin文件，提示更新BootWare版本的时候选择Y；
3、再次按Crtl+F格式化AP Flash；
4、再次导入V5版本APbin文件，这次更新主启动版本；
5、更新完成选择启动设备；

下面是详细更新步骤，操作信息标红显示：

System is starting...
Press Ctrl+D to access BASIC-BOOTWARE MENU
Booting Normal Extend BootWare
The Extend BootWare is self-decompressing............................Done!

****************************************************************************
* *
* H3C WA4320-ACN-C BootWare, Version 7.21 *
* *
****************************************************************************
Copyright (c) 2004-2020 New H3C Technologies Co., Ltd.

Compiled Date : Oct 16 2020
CPU Type : ATHEROS AR9563
CPU L1 Cache : 32KB
CPU Clock Speed : 775MHz
Memory Type : SDRAM
Memory Size : 128MB
Memory Speed : 560MHz
BootWare Size : 512KB
Flash Size : 16MB
PCB Version : Ver.B

BootWare Validating...
Press Ctrl+B to access EXTENDED-BOOTWARE MENU...    按Ctrl+B进入BOOTWARE

Password recovery capability is enabled.
Note: The current operating device is flash
Enter < Storage Device Operation > to select device.

==========================<EXTENDED-BOOTWARE MENU>==========================
|<1> Boot System |
|<2> Enter Serial SubMenu |
|<3> Enter Ethernet SubMenu |
|<4> File Control |
|<5> Restore to Factory Default Configuration |
|<6> Skip Current System Configuration |
|<7> BootWare Operation Menu |
|<8> Skip Authentication for Console Login |
|<9> Storage Device Operation |
|<0> Reboot |
============================================================================
Ctrl+Z: Access EXTENDED ASSISTANT MENU
Ctrl+F: Format File System
Ctrl+C: Display Copyright
Ctrl+Y: Change AP Mode
Enter your choice(0-9):                按Ctrl+F格式化Flash
Warning:All files on flash will be lost! Are you sure to format? [Y/N]Y.....     选择Y
............................................................................
..................
Format success.

==========================<EXTENDED-BOOTWARE MENU>==========================
|<1> Boot System |
|<2> Enter Serial SubMenu |
|<3> Enter Ethernet SubMenu |
|<4> File Control |
|<5> Restore to Factory Default Configuration |
|<6> Skip Current System Configuration |
|<7> BootWare Operation Menu |
|<8> Skip Authentication for Console Login |
|<9> Storage Device Operation |
|<0> Reboot |
============================================================================
Ctrl+Z: Access EXTENDED ASSISTANT MENU
Ctrl+F: Format File System
Ctrl+C: Display Copyright
Ctrl+Y: Change AP Mode
Enter your choice(0-9): 3             进入选项

==========================<Enter Ethernet SubMenu>==========================
|Note:the operating device is flash |
|<1> Download Image Program To SDRAM And Run |
|<2> Update Main Image File |
|<3> Update Backup Image File |
|<4> Download Files(*.*) |
|<5> Modify Ethernet Parameter |
|<0> Exit To Main Menu |
|<Ensure The Parameter Be Modified Before Downloading!> |
============================================================================
Enter your choice(0-5): 5          设备网络等信息

==========================<ETHERNET PARAMETER SET>==========================
|Note: '.' = Clear field. |
| '-' = Go to previous field. |
| Ctrl+D = Quit. |
============================================================================
Protocol (FTP or TFTP) :tftp ftp                      添写文件名称,网络IP等信息
Load File Name :host
:wa4300s_fit.bin
Target File Name :target
:wa4300s_fit.bin
Server IP Address :192.168.1.1 192.168.1.50
Local IP Address :192.168.1.253
Subnet Mask :0.0.0.0 255.255.255.0
Gateway IP Address :0.0.0.0
FTP User Name :user anonymous
FTP User Password :********

==========================<Enter Ethernet SubMenu>==========================
|Note:the operating device is flash |
|<1> Download Image Program To SDRAM And Run |
|<2> Update Main Image File |
|<3> Update Backup Image File |
|<4> Download Files(*.*) |
|<5> Modify Ethernet Parameter |
|<0> Exit To Main Menu |
|<Ensure The Parameter Be Modified Before Downloading!> |
============================================================================
Enter your choice(0-5): 1                      选择1加载到内存启动更新Bootware
Loading..........................................................Done.
7971840 bytes downloaded!
The image is self-decompressing.............................................
............................................................................
............................................................................
............................................................................
............................................................................
............................................................................
............................................................................
............................................................................
............................................................................
............................................................................
............................................................................
............................................................................
............................................................................
..........................................Done.
Extended BootWare Version is not equal,updating? [Y/N]Y         按Y更新Bootware
Updating Extended BootWare..........Done.
BootWare updated,System is rebooting now.
System is starting...
Press Ctrl+D to access BASIC-BOOTWARE MENU
Booting Normal Extend BootWare
The Extend BootWare is self-decompressing.........................Done!

****************************************************************************
* *
* H3C WA4320-ACN-C BootWare, Version 1.05 *
* *
****************************************************************************
Copyright (c) 2004-2016 Hangzhou H3C Technologies Co., Ltd.

Compiled Date : Jun 28 2016
CPU Type : ATHEROS AR9563
CPU L1 Cache : 32KB
CPU Clock Speed : 775MHz
Memory Type : SDRAM
Memory Size : 128MB
Memory Speed : 560MHz
BootWare Size : 512KB
Flash Size : 16MB
PCB Version : Ver.B

Read net params from bootrom failed, use the default value
BootWare Validating...
Press Ctrl+B to enter extended boot menu...              按Ctrl+B进入BOOTWARE
BootWare password: Not required. Please press Enter to continue.

Password recovery capability is enabled.
Note: The current operating device is flash
Enter < Storage Device Operation > to select device.

===========================<EXTEND-BOOTWARE MENU>===========================
|<1> Boot System |
|<2> Enter Serial SubMenu |
|<3> Enter Ethernet SubMenu |
|<4> File Control |
|<5> Restore to Factory Default Configuration |
|<6> Skip Current System Configuration |
|<7> BootWare Operation Menu |
|<8> Clear Super Password |
|<9> Storage Device Operation |
|<0> Reboot |
============================================================================
Ctrl+C: Display Copyright
Ctrl+Y: Change AP Mode
Ctrl+F: Format File System
Enter your choice(0-9):
Warning:All files on flash will be lost! Are you sure to format? [Y/N]Y.....      格式化Flash
............................................................................
..................
Format success.

===========================<EXTEND-BOOTWARE MENU>===========================
|<1> Boot System |
|<2> Enter Serial SubMenu |
|<3> Enter Ethernet SubMenu |
|<4> File Control |
|<5> Restore to Factory Default Configuration |
|<6> Skip Current System Configuration |
|<7> BootWare Operation Menu |
|<8> Clear Super Password |
|<9> Storage Device Operation |
|<0> Reboot |
============================================================================
Ctrl+C: Display Copyright
Ctrl+Y: Change AP Mode
Ctrl+F: Format File System
Enter your choice(0-9): 3            按3配置网络信息

==========================<Enter Ethernet SubMenu>==========================
|Note:the operating device is flash |
|<1> Download Application Program To SDRAM And Run |
|<2> Update Main Application File |
|<3> Modify Ethernet Parameter |
|<0> Exit To Main Menu |
|<Ensure The Parameter Be Modified Before Downloading!> |
============================================================================
Enter your choice(0-3): 3            按3配置网络信息

==========================<ETHERNET PARAMETER SET>==========================
|Note: '.' = Clear field. |
| '-' = Go to previous field. |
| Ctrl+D = Quit. |
============================================================================
Protocol (FTP or TFTP) :tftp ftp              还是填写相同的文件名和网络信息
Load File Name :host
:wa4300s_fit.bin
Target File Name :target
:wa4300s_fit.bin
Server IP Address :192.168.1.1 192.168.1.50
Local IP Address :192.168.1.253
Gateway IP Address :0.0.0.0 255.255.255.0
FTP User Name :user anonymous
FTP User Password :password

==========================<Enter Ethernet SubMenu>==========================
|Note:the operating device is flash |
|<1> Download Application Program To SDRAM And Run |
|<2> Update Main Application File |
|<3> Modify Ethernet Parameter |
|<0> Exit To Main Menu |
|<Ensure The Parameter Be Modified Before Downloading!> |
============================================================================
Enter your choice(0-3): 2             按2加载主启动文件
Loading..........................................................Done!
7971840 bytes downloaded!
Updating File flash:/wa4300s_fit.bin........................................
............................................................................
.......Done!

==========================<Enter Ethernet SubMenu>==========================
|Note:the operating device is flash |
|<1> Download Application Program To SDRAM And Run |
|<2> Update Main Application File |
|<3> Modify Ethernet Parameter |
|<0> Exit To Main Menu |
|<Ensure The Parameter Be Modified Before Downloading!> |
============================================================================
Enter your choice(0-3): 0       按0返回主启动菜单

===========================<EXTEND-BOOTWARE MENU>===========================
|<1> Boot System |
|<2> Enter Serial SubMenu |
|<3> Enter Ethernet SubMenu |
|<4> File Control |
|<5> Restore to Factory Default Configuration |
|<6> Skip Current System Configuration |
|<7> BootWare Operation Menu |
|<8> Clear Super Password |
|<9> Storage Device Operation |
|<0> Reboot |
============================================================================
Ctrl+C: Display Copyright
Ctrl+Y: Change AP Mode
Ctrl+F: Format File System
Enter your choice(0-9): 1          按1启动AP系统
Starting to get the main application file--flash:/wa4300s_fit.bin!..........
............................................................................
....................................
The main application file is self-decompressing.............................
............................................................................
............................................................................
............................................................................
............................................................................
............................................................................
............................................................................
............................................................................
............................................................................
............................................................................
............................................................................
............................................................................
............................................................................
..........................................................Done!
System application is starting...
Startup configuration file does not exist.
User interface con0 is available.

Press ENTER to get started.
<WA4320-ACN-C>
%Apr 26 12:01:18:520 2000 WA4320-ACN-C SHELL/5/SHELL_LOGIN: Console logged in from con0.
<WA4320-ACN-C>DIS
<WA4320-ACN-C>display ver
<WA4320-ACN-C>display version           查看降级后的版本，降级到了V5
H3C Comware Platform Software
Comware Software, Version 5.20, Release 1508P06
Copyright (c) 2004-2016 Hangzhou H3C Tech. Co., Ltd. All rights reserved.
H3C WA4320-ACN-C uptime is 0 week, 0 day, 0 hour, 1 minute

CPU type: ATHEROS AR9563
128M bytes DDR2 SDRAM Memory
16M bytes Flash Memory
Pcb Version: Ver.B
Basic BootROM Version: 1.04
Extend BootROM Version: 1.05
[SLOT 1]CON (Hardware)Ver.B, (Driver)1.0
[SLOT 1]GE1/0/1 (Hardware)Ver.B, (Driver)1.0
[SLOT 1]RADIO1/0/1 (Hardware)Ver.B, (Driver)1.0
[SLOT 1]RADIO1/0/2 (Hardware)Ver.B, (Driver)1.0