Bios Update Question

Aramat

Honorable
Aug 3, 2014
46
0
10,540
Hi, I have a Big bang II XPower with a 3930k, great board, great processor. I now have a 4960x Chip and want to update bios to enable the board to use it. My question is:
"* Please download and execute the file in USB pen drive only."
What is a pen drive?