First, you need the right tools for the job. Restart your computer and press or hold down the appropriate key to enter your system BIOS. This is usually the key. However it may be F2 or F8 on some laptops and desktop systems. The update utility is often part of the download package from the manufacturer. If not, then check with your hardware provider. Leave the stick plugged in to your computer and then restart the system. Upon restart, enter the BIOS again using the method above.
Once started, you will be asked to navigate to the BIOS file. Creating one is easy enough. You can also create one from an existing ISO image if you would prefer. Press and in a few short minutes your bootable USB stick will be ready. Leave the USB stick plugged in to the computer. Then restart the system. Press or hold F11 as the system restarts. This will take you to the Boot Selection where you can set a boot device.
Make sure you set your bootable USB stick as your boot device and then press. Going forward, each flash utility is a bit different but simple enough to understand. Plus they all provide info on how to proceed once the application is initiated in DOS. After a check for compatibility the update should be ready.
Click or to confirm and begin. Remember to back up your existing BIOS before beginning. This will be handy if you run into issues during the update or if you do not like the performance or features that come with the updated BIOS. Not all new updates are preferred. Ultimately it will be up to you to decide if your system will benefit from an updated BIOS.