I just followed post #1 to clone OS with diablo to internal sd. Then I entered the command chroot /mnt/initfs cal-tool --set-root-device ask:mmc2 to set default boot to mmc2. It returns "chroot not found". I try sudo gainroot, cd .. to the top, same result. The instruction states I need to become root. Since I am not good in linux, I think I left out same thing.