Bios updates cannot install by using the Dell Update app. You must download and install it yourself.

Bios is not a driver. It is an update of the operating system. It does not have anything to do with your problem. It is an Intel security update. You should solve the problem before updating the bios. Remember updating the bios can be risky and can brick your computer. Make sure to plug in the adapter whenever you update drivers and bios. Your battery needs to be charged as well as on the adapter whenever you are updating bios.

You are doing damage by pressing and holding down the start button. That means you are shutting down the computer and restarting, not starting it. If the computer is hibernating, a brief press of the button should wake it, but it will be slower start up.

You might not be shutting the computer down correctly. You should shutdown by right clicking the start button and selecting Shutdown. The computer hardware start button on the laptop is for turning it On, not turning it off.