The computers use either of the UEFI mode boot or BIOS mode boot. When installing an OS, the hard drive must be configured for the booting mode. Otherwise, we may not be able to install the OS. This article shows you how to switch the booting mode on Dell computer.
1. Press F12 when turning on the Dell computer. Select BIOS Setup.
2. If you want to use Legacy BIOS mode boot, you must disable Secure boot.
3. Go to boot sequence, check Legacy under boot List Option.
4. Go to Advanced Boot Options, check Enable Legacy Option ROMs.
5. Apply and exit to Save the settings.
Please view this step by step video:
