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。