Some additional, helpful add-ons and comments regarding dual-booting: I recommend this extra tweak: To get boot menu that defaults to internal card, and to set whether to ask each time or not, enter this code as root: Code: chroot /mnt/initfs cal-tool -R ask:immc2 For more info on this and other boot menu tweaks, see the ReadMe in initfs_flasher folder and this post.
chroot /mnt/initfs cal-tool -R ask:immc2