in this image you need to change the root disk
mount your sdcard
in the file /boot/uEnv.txt remove the line rootdev=/dev/mmcblk1p1
and also change the file /etc/fstab mmcblk1p1 on mmcblk0p1
mount your sdcard
in the file /boot/uEnv.txt remove the line rootdev=/dev/mmcblk1p1
and also change the file /etc/fstab mmcblk1p1 on mmcblk0p1