重启交换机，按住mode键。

    flash_init

    switch: dir flash:

    switch: rename flash:config.text flash:config.old

    switch: boot

    Would you like to enter the initial configuration dialog? [yes/no]: no

    Switch>en

    Switch#rename flash:config.old flash:config.text

    Destination filename [config.text]?

    Switch#copy flash:config.text system:running-config

    Destination filename [running-config]?

    修改telnet和console密码

    至此密码恢复完成，reload验证一下即可。