|Why do you want to update the BIOS?|
You should only do this if the update addresses a specific problem you are having. A BIOS update can fail for a variety of reasons even if you do everything right. A failed update is a very serious matter, particularly on a laptop. In many cases the only recovery is replacing the motherboard, which is often just as costly as a new computer.
This forum has many stories of failed BIOS updates. Most of them do not have happy endings.