ASUS Chromebox 3 HDMI port not working. Can I flash new firmware?

Hello my first post here.
Need some advice. I just bought an ASUS Chromebox 3 from eBay and plan to install Linux/Home Assistant on it. So I need to reflash the UEFI Full ROM support.
However, the HDMI port is bad and I can only use the USB-C port for the monitor.
My question is can I still flash the UEFI rom using the developer mode script? My concerns if the new rom requires the HDMI for display afterwards, I would have basically bricked it as I would not be able to see the prompt.

the USB-C port will continue to function normally for DP alt mode after flashing the UEFI firmware.

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