コマンドオプションサンプル:shutdown /fw

コマンドサンプルを検索した結果です。

shutdown /fw /r /t 10" from an elevated Command Prompt and see if causes the computer to restart in 10 seconds and go directly into the BIOS settings
    Solved: X220 BIOS hard to access - Lenovo Community : http://forums.lenovo.com/t5/ThinkPad-X-Series-Laptops/X220-BIOS-hard-to-access/td-p/476091
shutdown /fw /r /t 10" from an elevated Command Prompt and it seemed to work correctly on all of them
    Entering UEFI (BIOS) firmware on Windows reboot - Windows Support - Neowin : http://www.neowin.net/forum/topic/1345664-entering-uefi-bios-firmware-on-windows-reboot/

shutdown のオプション一覧