Creating bootable stick to flash Bios

Hi,

i have a problem creating the stick to boot from and flash my bios.
i use this guide to create the stick.
I select those three Dos Files provided in the download link, but the tool just doesnt put them onto the stick. So when i boot and run the flash file i'll always get an error.
Did i miss sth or did sth wrong? Please help me, i really need to use a new Wifi card in my lenovo laptop!

Thanks in advance!

Greetings
Eric