@RobertCNelson I’m trying it out and will update here with progress.
I have one more question: For the last step in File Systems Table (/etc/fstab):
sudo sh -c “echo ‘/dev/mmcblk0p2 / auto errors=remount-ro 0 1’ >> /media/rootfs/etc/fstab”
should I replace mmcblk0p2 with sdb2 (referring to my SD card)?