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UEFI setup hang with HP Elitedesk 800 G4 USB-C Alt Mode connected to USB-C monitor,

HP Recommended
HP Elitedesk 800 G4
Microsoft Windows 10 (64-bit)

I had a HP Elitedesk 800 G4 which have USB-C Alt Mode config and  connected to USB-C monitor, but once I try to enter UEFI config page, the system hangs.

Also the system not accept Function key during boot up if I connected to USB-C monitor or HDMI TV screen, I needs connected to DP monitor to get into BIOS/UEFI setup screen.


Any ways to let HP know and fix this issue? My country (Hong Kong) always not available for support chat

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