在交换机启动时候按CTRL+B进入BOOT MENU，中间bootrom的密码默认为空。 Press Ctrl-B to enter Boot Menu... 1 password: BOOT MENU 1. Download application file to flash 2. Select application file to boot 3. Display all files in flash 4. Delete file from flash 5. Modify bootrom password 6. Enter bootrom upgrade menu 7. Skip current configuration file 8. Set bootrom password recovery 9. Set switch startup mode 0. Reboot