I have the same problem that Coderdude.
I want to install a ESXI 5.1 on a server I monted (motherboard Asus H87I-PLUS) but when a want to boot on the Usb keys, I have two error message :
3>Command line is empty.
<3>Fatal error: 32 (Syntax)
I try with a Esxi Image 5.5 and 5.1 with the program toedit images Rufus, Unetbooting and LinuxLive USB and always fail and it's ok when I boot with a Linux image to try.
For infomation my Secure boot state is Disable and OS Type is Other OS.
I can see onvarious forumsneedto add variousfilestoiso... if someone have an idee to help me... :-)
Thanks