Changing the boot order of the 'bootable' devices on your computer, such as your hard drive or bootable media in a USB port (e.g. flash drive), floppy drive, or optical drive, is very simple.
How to Change the Boot Order in Your Computer's BIOS [For Beginners]
There are several scenarios where it is necessary to change the boot order, for example, when launching certain data destruction utilities and bootable antivirus programs, as well as when installing an operating system.
The BIOS setup utility allows you to change the boot order settings.
Follow these steps to change the boot order in BIOS. A change to the boot order changes the order in which devices are booted.