Wimboot issue Wyse Terminal 5020

[andrew]

Hey Guys

So I have a couple Wyse Terminals, model 5020, that I have in my office. I was play around with them booting iPXE and seeing if I could get a Windows install to load. I setup a simple menu which the following option:

:cdrom
clear net0/ip
set net0/ip [clientip]
sanunhook
chain http://[serverip]/clone.php?mac=${net0/mac:hexhyp}&serverip=[serverip] || exit
exit

:installwin8x
clear net0/ip
set net0/ip [clientip]
chain http://[serverip]/clone.php?mac=${net0/mac:hexhyp}&serverip=169.254.10.26
imgfree
kernel http://[serverip]/live/wimboot
initrd http://[serverip]/live/win81/bcd BCD
initrd http://[serverip]/live/win81/boot.sdi boot.sdi
initrd http://[serverip]/live/win81/boot.wim boot.wim
imgstat
boot

If we select the CDROM option, the machine reboots and the boot process starts over. If we select the Install Windows 8x option WIMBOOT goes to a black screen and I get:

Using bootmgr.exe va 0x2b9c8 len 0x9cb58
...extracted bootmgr.ext
Emlating drive 0x01

and if we just boot to a normal DVD Drive, they work fine and load the installer. We're currently using the UNDIONLY bin format. Has anyone seen this or been able to get the Wyse Terminals to work?