Just completed a "from zero" sdcard install for marsboard. Followed by importing the big four, Xprogs, flwm_topside, wbar, and xorg-fbdev.
Rebooted and worked as expected. Note that they are suprious boot time messages that can be ignored.
Hopefully, for your case, all you need to do is update uEnv.txt with desktop=flwm_topside.
Otherwise have patience with these microsd cards.