Hello.
I tried to flash newest Embedded Linux v2.7b4 on Colibri VF50, but it hangs by reading ubifs.img (see screenshot).
Download URL is http://developer.toradex.com/files/toradex-dev/uploads/media/Colibri/Linux/Images/Colibri-VF_LXDE-Image_2.7b4-20171005.tar.bz2
Flashing this Linux on VF61 is going without problems.
Flashing Linux v2.7b3 (size 60Mb) on VF50 is also going without problems.