Visit www.support.dell.com and select "I’m Looking for Drivers and Downloads".

Select your machine type (Laptop / Desktop) Then your family model, then the specific model within that family.

Once you arrive at the main page for your hardware expand the bios section and click the link Dell – Bios

Next Download your Bios file.

Bios files are typically small so should download quickly.

Once downloaded, come out of everything and make sure your laptop is on mains power. Then run the bios file you downloaded.

It will confirm the current bios level and tell you want number it’s going to upgrade too.

The last prompt you will see is this one.

When you click ok your laptop will immediately reboot, it will then perform the bios upgrade on a DOS like white screen and then reboot.

It may take longer than usual to load the Bios the first time it’s run, So leave it. It should only be a moment or so.

Then your laptop will boot windows and the upgrade is complete.