I’m unsuccessfully trying to get into the boot options menu.
I press Shift, keep it down and then select to boot the USB stick in UEFI while still holding the key down. I tried the same with the Space key. Both doesn’t stop the normal boot process. I tried Legacy BIOS boot, too. (I have CSM.)
Try repeatedly pressing the space key as fast as you can.
On some devices,it doesn’t detect whether the key is being constantly held down,but it does detect the key down event at a very specific moment during the early boot process.