I just bought this laptop Asus Vivobook S15 x512
and now I need to reinstall the OS but there is no option to change the boot device
No UEFI setting
No Launch CSM
No option to boot from USB
Need Help Guys...........!
I got this to work. Create a bootable USB key or USB HDD using a free tool called YUMI UEFI (you almost certainly need the UEFI version.)
Select the Windows 10 ISO file in YUMI and add it to your boot key/disk.
When you turn on or restart the laptop, hold the Esc key down and it'll give you an option to boot off the USB device.