求华为2611路由器密码清除方法？

本人按照网上的方法做了一次，可能是版本的问题，没有清除得了。以下是我机器的启动信息，知道的朋友请说一下，谢谢！
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* Quidway Series Router Boot ROM, V7.08 *
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Copyright(C) 2003-2003 by HUAWEI TECH CO., LTD.
Compiled at 19:56:55 , Jan 10 2006.

Testing memory...OK!
64M bytes SDRAM
8192k bytes flash memory
0k bytes NVRAM memory
Hardware Version is MTR 1.0
CPLD Version is CPLD 1.0

Press Ctrl-B to enter Boot Menu

网上说按Ctrl-B，出现5个选项，但我这时出现7个
Please input Boot ROM password:

Boot Menu:
1: Download application program with XMODEM
2: Download application program with NET
3: Clear configuration
4: Start up and ignore configuration
5: Boot ROM Operation Menu
6: Do not check the version of the software
7: Exit and reboot
Enter your choice(1-7):

按3可能会清除密码，但是也会清除配置，我想在不清除配置的情况下清掉密码。按5出现
Boot ROM Operation Menu:
1: Download Boot ROM with XModem
2: Download Extended Segment of Boot ROM with XModem
3: Restore Extended Segment of Boot ROM from FLASH
4: Backup Extended Segment of Boot ROM to FLASH
5: Exit to Main Menu
Enter your choice(1-5):
如何清除密码，谢了！

选3会清除配置,选4会忽略配置以出厂设置启动

启运完毕后将路由器配置DOWN下后更改密码后再导入
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路由器都有复位键的.在后面.你按下过几秒就恢复出厂设置了