How to boot a Dell laptop using an external device?

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How to boot a Dell laptop using an external device?

This page assumes that you already have a bootable USB stick. The instructions below (to be completed) will indicate how to use your USB stick to boot your Dell laptop.

to be completed...
Bios boot for Dell Inspiron 15 5580.
Start the laptop, then press f2 two to three times continuously until the bios setting will come out.
Choose the appropriate command in the bios setting in your preference.