I was observing the same symptoms as mizar44. I think the problem started after some changes I had made to the uBoot environment settings. What helped me just now was to reflash uBoot using Jeff's script. http://jeff.doozan.com/debian/uboot/ At the end, the script reset the uBoot environment for me, and now my E02 boots again from the USB flash drive. (I have not tried booting frby laufer - uBoot