mine had no OS when I got it. I imaged it with E09 by mistake. So I obtained E11 image from another team. tried the e11 and then I got same error as you. I am going out on a limb, and am wiping the drive and will try e11 image again. Hope the e11 image has all of the classmate partitions on it.
That’s understandable. The E09 image is obviously intended for the E09 Classmate. If you have an E11 Classmate, you should have received the E11 flash drive. Is that not the case?
I was able to make a bootable USB drive (8gb) from an ISO image from an original E11 usb drive that was sent to me from another team. The image is large, 4.5Gb. I used RMPrepUSB to write it to a blank 8GB USB drive. I expect the problem you are having is in the boot sector of the USB drive.
Please pull your FTP info off the page and send as a private message if you REALLY think necessary. By posting the files online your are violating the Microsoft lisencing. You might also be contacted by your host to remove the copywrited software (or they might do it for you). The issues with the USB drives can be fixed with the dozen or so posts on CD.