BootLoader密码遗忘
BootLoader缺省无密码，首次进入BootLoader主菜单需要设置密码。
如果忘记密码，需要清空密码然后重新设置。
通过长按RESET按钮，清除BootLoader密码。长按RESET按钮5秒，设备将重启，重启后BootLoader密码被清空。
长按RESET按钮后设备会使用出厂配置重启，并删除当前的配置文件，为了防止配置文件丢失，按RESET按钮前请务必先备份当前的配置文件。
管理员帐号密码遗忘
设备缺省无帐号，首次登录设备需要新建帐号和密码。如果忘记密码，可通过其他帐号或者Console口登录设备修改目标帐号的密码。当Console口密码也忘记时，可通过BootLoader菜单清除Console口密码，然后登录设备修改目标帐号的密码。
通过BootLoader菜单清除Console口密码并登录设备。
Press CTRL+B to enter BOOT menu: 3
Info: The password is empty. For security purposes, change the password.
New password:
Confirm password:
The password is changed successfully.
Main Menu
1. Default startup
2. Serial submenu
3. Ethernet submenu
4. Startup parameters submenu
5. List file
6. Password manager submenu
7. Restore factory defaults
8. Reboot
Enter your choice(1-8): 6 //进入密码管理子菜单
Password manager submenu
1. Modify bootloader password
2. Clear the console login password
3. Reset bootloader password
0. Return
Enter your choice(0-3): 2
Caution: A new console password must be set after the restart.
Continue now? Yes(y) or No(n): y
Clear Console Lockword Successfully.
Please Press ENTER.
*****************************************************************
* Copyright (C) 2020-2020 *
* Huawei Technologies Co., Ltd. *
* All rights reserved. *
* Without the owner's prior written consent, *
* no decompiling or reverse-engineering shall be allowed. *
*****************************************************************
Info: The max number of VTY users is 5, the number of current VTY users online is 0, and total number of terminal users online is 1.
The current login time is yyyy-mm-dd hh:mm:ss.
<HUAWEI>
