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If you need to enter the BIOS: bring up the terminal, and write `systemctl reboot --firmware-setup` This reboots systemd-powered systems to the UEFI menu. May not work on other init systems, but SteamOS is based on Arch with systemd.


You can do the same on Windows with the command `shutdown /r /t 0 /fw`.


Systemd systems can still have grub as a boot loader.

In that case, you can usually set the boot order with bootctl and reboot.


Shouldn't matter what you have as a bootloader, by my understanding it should be communicating with the UEFI directly to pull it off and going over any bootloader's head.




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