How to Disable UEFI Secure Boot in Windows 10
UEFI (Unified Extensible Firmware Interface) is a standard firmware interface for new PCs pre-installed with Windows 8/10, which is designed to replace BIOS (basic input/output system).
Basic steps: Access UEFI BIOS settings and disable "Secure Boot" option, then change "Boot List option" as "Legacy", and enable "Load Legacy Option Rom", then follow a traditional method to boot computer from USB device or CD-ROM.
Part 1: Access UEFI BIOS by PC Settings
Navigate to Settings. You can get there by clicking the gear icon on the Start menu.
Then in Settings window, choose Update & security.
Nest, select Recovery from the left menu and you can see Advanced startup at the right side.
Click Restart Now under Advanced startup option. The comptuer will reboot to a special menu.
Now you will be presented with the Choose an option screen, simply select Troubleshoot.
Next select Advanced options.
Next you select UEFI Firmware Settings.
Click the Restart button. Your system will restart and take you to the UEFI BIOS.
Once you're in the UEFI utility screen, move to Boot on the top menu and here you can see the option to turn off secure boot in Windows 10. Use the arrow key to go to Secure Boot option and then press enter to select it. Use + or – to change its value (enable, disable).
Note: Depending on the motherboard's BIOS/ UEFI firmware, the "Secure Boot" option will be found on the "Boot", "Security", or "Authentication" page.
HP Secure Boot
ASUS Secure Boot
Acer Secure Boot
ASRock Secure Boot
Next, press F10 to save the changes and exit the UEFI settings.
That's for how to disable secure boot in Windows 10. Note that if you are Arm based Windows RT PCs and devices users, you can't disable secure boot because these devices have a locked boot loader.