The C92 was running an American Megatrends UEFI aptio BIOS. The build date of the BIOS was 12/19/2018.
On powering up I found pressing the F12 key was the only one that apparently did anything. None of the other function keys nor the DEL key interrupted the boot sequence. I would also note that I was using a DVI input monitor connected to the Display Port socket via an adapter. If it booted the local OS I briefly had a Huawei splash screen and that was it. I had no monitor with an HDMI input to check if this port was the active screen display.
The F12 key brought up the menu:
Please select boot device:HDD0 SanDisk Cruzer Blade 2.01 Enter Setup↑ and ↓ to move selection
ENTER to select boot device
ESC to boot using defaults
At the time I had one of my SanDisk USB drives plugged into a USB port. Essentially the BIOS populates the selection box with any mass storage devices it finds that might be bootable.
The BIOS had a fairly extensive range of items that could be enabled/disabled.