tar xf lede-17.01.0-rc2-r3131-42f3c1f-kirkwood-pogo_e02-squashfs-sysupgrade.tar
unsquashfs sysupgrade-pogo_e02/root
mkdir squashfs-root/boot
cp sysupgrade-pogo_e02/kernel squashfs-root/boot/uImage

mkfs.ubifs -r squashfs-root/ -m 2048 -e 129024 -c 1032 -o lede-kirkwood-pogo_e02-root.ubifs
ubinize -vv -o lede-kirkwood-pogo_e02-root.ubi -m 2048 -p 131072 -s 512 lede-kirkwood-pogo_e02-root.ubifs.conf