When you start a computer, before the operating system, BIOS or UEFI runs. Most people never see it, but it is an important part of the computer. Let us explain what it is, what it is for and when it does (and does not) make sense to update it.

What BIOS and UEFI are

BIOS and UEFI are the basic software (firmware) built into the motherboard that runs first when the computer is turned on. It handles recognizing the hardware, tests it and starts the operating system from the disk.

  • BIOS is the original, older system.
  • UEFI is its more modern successor, which you find in all new computers today. It has a clearer interface, support for large disks and better security.

In everyday speech, however, UEFI is also often called BIOS.

What it is for

  • Recognizing and testing hardware at startup.
  • Starting the operating system from the disk.
  • Basic settings, like boot order, time, or enabling features like virtualization.
  • Security, for example a password at startup or Secure Boot.

You usually get into the settings by pressing a key (often Del or F2) right after turning the computer on.

When it is worth updating

Updating BIOS/UEFI solves specific problems, it is not routine maintenance like system updates. It makes sense when:

  • The manufacturer fixed a security flaw in the firmware.
  • It adds support for new hardware, for example a newer processor or memory.
  • It solves a specific problem you have and the manufacturer fixed it in the new firmware.
  • It adds a needed feature or improves stability.

When rather not to update

And now the important part. If the computer works and you have no specific reason, do not update the BIOS just because. The old rule holds: do not fix what works.

  • Risk. If the update fails (for example a power outage during it), it can damage the motherboard and the computer may not start. This is more serious than with an ordinary program.
  • No benefit without a reason. If none of the above problems bother you, an update adds you nothing, just adds risk.

How to do it safely

If an update is really needed:

  • Use the correct file exactly for your motherboard model. The wrong firmware is dangerous.
  • Ensure power. For a laptop a charged battery and adapter, for a desktop ideally a backup power supply (UPS).
  • Do not turn the computer off or restart it during the update.
  • When in doubt, leave it to a professional. A broken BIOS is an unpleasant problem.

Conclusion

BIOS and UEFI are the basic software that starts your computer and enables basic settings. Updating it makes sense only for a specific reason (security, new hardware, fixing a problem). If the computer works, do not start an update without a reason, the risk outweighs the benefit.

Need advice on setup, a BIOS update or dealing with a computer that will not start? Get in touch, we will solve it safely.