I downloaded the latest version of the wyse USB imaging tool, v 1.15, ran the tool, formatted an 8 gig thumb drive, pointed it to the .rsp file for the R90, and then connected it to the wyse terminal. I powered on the wyse terminal, hit P a few times, selected the thumb drive to boot to, and it would hang up on a black dos screen with a flashing cursor. I tried this several times just in case I was doing something incorrectly and each time I ended up stuck at the same screen. After scouring the web I finally came across a posting from someone who ran into a similar problem, the USB tool does not seem to work if you run it from a windows 7 computer. As the message board suggested, I tried from a windows XP computer and immediately the problem was solved!
Thanks for the post MrAdam
http://community.spiceworks.com/topic/165561-wyse-usb-firmware-updater-thingy-pain-in-the-butt-deal
Wyse clearly states that win7 is supported in their guide, however clearly it is not.
https://appservices.wyse.com/supportdownload/WDM/USB_Firmware_Tool_1.15_Users_Guide_SEP2011.pdf
It seems like I will have to keep an old XP computer lying around for years to come!
