Before downloading, check what version you are currently running to see if an update is necessary.
This requires creating a bootable USB stick and flashing from a pure DOS environment.
Pros: Very safe, no OS interference. Cons: More complex.
Recommendation: Use Method A if your Windows runs fine. Use Method B if your current BIOS is corrupted or Windows won't boot.
Before proceeding, read the following precautions carefully to avoid "bricking" (rendering unusable) your laptop: