Since Lollipop, I can no longer access hboot via /dev/block/mmcblk0p11, and when I do # mount | grep blk, it shows:
/dev/block/mmcblk0p45 /system ext4 ro,seclabel,noatime,data=ordered 0 0
/dev/block/mmcblk0p46 /cache ext4 rw,seclabel,nosuid,nodev,relatime,data=ordered 0 0
/dev/block/mmcblk0p39...