Every computer has something called the BIOS or Basic Input/Output System.
Think of the BIOS as the computer’s starter system.
When you press the power button, the BIOS is the very first thing that wakes up. Before Windows loads. Before you see your desktop. Before anything else.
Its job is to:
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Check that your hardware is working (memory, processor, drives)
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Tell the computer how to start
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Hand control over to the operating system (like Windows)
If the BIOS doesn’t work, the computer can’t start.
So What Is a BIOS Update?
A BIOS update is when the manufacturer installs a newer version of that starter system.
Why would they do that?
Usually to:
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Fix hardware bugs
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Improve stability
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Add support for new components (like a newer processor)
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Improve security
It’s similar to updating Windows — but it happens at a deeper level.
Why Is It More Sensitive Than Normal Updates?
When you update Windows, if something goes wrong, it’s usually fixable.
But when you update the BIOS, you are rewriting the small program that allows the computer to turn on properly.
If the computer loses power during that update, it may not know how to start anymore.
That’s why you should:
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Never turn off the computer during a BIOS update
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Make sure a laptop is plugged in
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Avoid performing it during unstable power conditions
Simple Way to Remember It
Windows update = updating the software you use.
BIOS update = updating the instructions that let the computer start.
One works after the computer is running.
The other works before the computer even wakes up.
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