for me it was the secure boot.
hit f2 while it boots… and in that menue there is a option on the buttom left… dunno the exact saying rn, but sth with secure boot… there you can turn of secure boot
edit: another tip: i could only disabled it while the usb stick was not attached to the laptop. you need to do it like this: Boot without usb stick… hammer f2, disable secure boot, insert usb stick, reboot.