准备一台运行仿真终端程序的pc ，推荐使用procomm或者windows hyper terminal(超级终端)。
将pc 的串口和路由器的控制台口用配套的控制线连接。
路由器重启，在超级终端上执行ctrl+c ，使路由器进入rom 模式，出现以下菜单。main menu:
1. tftp download & run
2. tftp download & write into file
3. x-modem download & run
4. x-modem download & write into file
5. list active files
6. list deleted files
7. run a file
8. delete a file
9. rename a file
a. squeeze file system
b. format file system
c. other utilities
1. tftp download & run
2. tftp download & write into file
3. x-modem download & run
4. x-modem download & write into file
5. list active files
6. list deleted files
7. run a file
8. delete a file
9. rename a file
a. squeeze file system
b. format file system
c. other utilities
1. tftp download & run
2. tftp download & write into file
3. x-modem download & run
4. x-modem download & write into file
5. list active files
6. list deleted files
7. run a file
8. delete a file
9. rename a file
a. squeeze file system
b. format file system
c. other utilities
通过以上操作，将配置文件config.text 改名为config.bak。这样启动路由器进入主模式之后，路由器找不到配置文件config.text，就会以默认配置运行路由器，这样就避开了原先配置的用户口令了。
进入路由器的大版本,再把配置恢复回来,并且重新修改密码
进入大版本后,执行以下的操作来恢复原先的配置
通过以上的步骤，我们就把原先在rom 版本改名的配置文件恢复回来了，现在您要做的只要把enable密码修改一下，记住修改后的密码，下次进路由器用修改后的密码登陆，就没有问题了。