How to create a bootable USB pendrive for EFI BIOS update?

I have already tried to contact my motherboard reseller and the manufacturer BCM but unfortunately did not receive a response to my support request.

I have the following BCM MX3350N motherboard which I need to update with the latest EFI BIOS:

https://www.bcmcom.com/bcm_product_MX3350N.html

The manual of this motherboard, which can be found on this link, does not specify how to update the BIOS.

I can find the latest available driver in the download section:

https://www.bcmcom.com/admin/Bios/71524310.zip

This zip file contains the followung files:

- 71524310.bin
- EFUx64.EFI
- FLASH.NSH

There is a very broad section on the BCM website that describes in general terms how the BIOS update process works without providing any model-specific details:

https://www.bcmcom.com/bcm_support_drivers.html

"With the BIOS update utility, you can update the BIOS from a floppy disk, bootable CD-ROM, bootable USB flash drive or other bootable USB media. (Information on how to create a bootable USB device or CD is listed in below.)

Using the BIOS update is a four-part process:
Part 1: Create the bootable media (floppy, CD or USB device)
Part 2: De-compress the downloaded file to the bootable media
Part 3: Boot up the computer from bootable media
Part 4: Execute bat file and Reboot the computer"

The section on how to create a bootable USB device only states the following and the suggested tutorial links are dead:

"Making a USB flash device into a bootable drive is not as simple as creating bootable floppy disks. Please refer to the documentation provided by the manufacturer of your USB device for information on how to create a bootable USB device. Additionally, you may refer to any of the following websites for tips on creating bootable USB devices. BCM is unable to assist with the creation of bootable devices."

I know how to write an ISO image of an OS to a USB stick in Linux but I am a bit lost how to write the mentioned BIOS files to USB device and make it bootable.

Could you please guide me how to format the USB stick and make it bootable so that I can update EFI Bios of my mainboard?

Your help is much appreciated!