ASUS UEFI BIOS not recognizing USB drive

[danben]

I'm running version 2.16.1242 of the BIOS on a Rampage V Extreme. Made the Unibeast stick as per the Yosemite guide and I THINK I have the right BIOS settings. For some reason the USB drive isn't being recognized at all. I can insert another random USB stick and that shows up, so it's not the port. Does anyone know how I might troubleshoot this or what I might try changing?

 

[danben]

One thing I just tried was using one of the USB sticks that it did recognize to see if it was the drive itself, but something about reformatting as MOSX Journaled and putting Unibeast on it is causing the issue.