If you’re on Windows, you can usually reboot into the bios by going to: Start Menu, click the power button as if you’re going to shut down, then hold the ‘shift’ key and click Restart. It’ll reboot and take you to Windows boot options, then from there just click Troubleshoot → Advanced Options and then select UEFI Firmware Settings or the bios option, or whatever it is specific to your board.
Uhm, FYI: this is a home assistant forum and the OP has a problem with a HA Green which runs HAOS.
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The OP has an issue with a mini PC called Firebat T8PLUS, which usually comes with a Windows image installed.
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Owkay, thanks for clarifying! 
OTOH: it is of no use for OP anymore as I think he will not install Windows again just to solve this issue…
Maybe desperation is setting in. 
This one comes with NVMe as the boot disk. If the OP is desperate to sort this out and aware of how to open this tiny box, removing the drive may force the system to BIOS prompts as I mentioned above. If the console is accessible your suggested HA command may work as well.
I read your post and also replied to the method. 
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