No BIOS display on HDMI

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I just received the new UP Squared Edge computer and connected it to monitor by HDMI. It doesn't have any display during booting until pre-installed Ubuntu boot up.
I've tried to use a HDMI-VGA and DP-VGA adapter connected to monitor via VGA cable, it works during booting, I can enter BIOS pressing F7.
Could anyone tell me why UP Squared Edge cannot show BIOS via HDMI?

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