local rootdev=$(cat /tmp/sysupgrade.rootdev)
blockdev --rereadpt /dev/$rootdev
local datadev=$(get_partition $rootdev rootfs_data)
[ "$datadev" ] || echo "no rootfs_data partition, cannot keep configuration." >&2
dd if="$UPGRADE_BACKUP" of=/dev/$datadev
sync
local rootdev=$(cat /tmp/sysupgrade.rootdev)
blockdev --rereadpt /dev/$rootdev
local datadev=$(get_partition $rootdev rootfs_data)
[ "$datadev" ] || echo "no rootfs_data partition, cannot keep configuration." >&2
dd if="$UPGRADE_BACKUP" of=/dev/$datadev
sync