Some of Intel 9th generation processor are non graphics processor such as Intel i3 9100F, i5 9400F or i7 9700F...
In order to support these processor you will need to flash the latest BIOS first.
Also the most important thing is that you have to use a processor with integreted graphics to flash the latest BIOS and make sure you connect the monitor's connector to onboard HDMI or D-Sub.
BIOS Download:
TB360-BTC Pro -> https://www.biostar.com.tw/upload/Bios/B36AF505.BSS
TB360-BTC D+ -> https://www.biostar.com.tw/upload/Bios/B36CF505.BSS
How to flash BIOS -> https://www.biostar.com.tw/app/en/support/faq_content.php?S_ID=491
