KACE Product Support

I have a XPS13 9333 /w BIOS A04 with a Startech USB2.0 Ethernet Adapter (USB21000S2).  I'm trying to get this to boot into our KBE.  It just hangs on the loading boot sector and never makes it to the KBE.  I was going to try and downgrade the BIOS but on the Dell Support site it is not listing the older BIOS versions of the XPS13 9333.  I've opened up a ticket with KACE support but wanted to see if the IT Ninja community can help out.  Thanks!