On a Dell Inspiron 3493 laptop with a Windows 10, 64 bit preinstalled, I have tried to test some Linux distributions (Linux Mint 19.3 Cinnamon 32 bit, Linux Lite 64 bit last version). I created bootable usb by RUFUS.
Unfortunately, by pressing F12 at startup, the option for booting from usb is not shown. By pressing F12, two options appear as UeFI boot devices: 1- Windows boot manager, 2- UEFI hard drive, by pressing both option the Windows 10 is started.
I have tested many options in the bios (for example, disabling secure boot) but the usb boot option does not appear
In the bios, it is noted that “the legacy boot option is not supported on this platform”. If that matters, the bios exactly looks like the one given in this video https://www.youtube.com/watch?v=Kv82a1-TyqU
I cannot use the answers given in Booting from USB when BIOS doesn’t support it? because the device does not have CD DVD rom drive.
