1. Put Micro SD card into slot or plug in  USB flash
  2. Run
wget -O simplesd.sh https://www.dropbox.com/s/jl4oytptxrb6q5u/simplesd.sh?dl=0 --no-check-certificate
/bin/ash simplesd.sh
nano simplesd.sh
opkg update
opkg install e2fsprogs fdisk
if fdisk -l |grep /dev/sda > /dev/null; then
    echo "Start"
else
    echo "/dev/sda not found!"
    exit 0
fi
dd if=/dev/zero of=/dev/sda bs=4096 count=10
(echo n; echo p; echo 1;  echo;  echo; echo w)  | fdisk /dev/sda
umount -f  /mnt/sda1
mkfs.ext4 /dev/sda1
mkdir -p /mnt/sda1
mount  /dev/sda1 /mnt/sda1
mkdir -p /tmp/cproot
mount --bind / /tmp/cproot
tar -C /tmp/cproot -cvf - . | tar -C /mnt/sda1 -xf -
umount /tmp/cproot
uci add fstab mount
uci set fstab.@mount[0].target=/
uci set fstab.@mount[0].device=/dev/sda1
uci set fstab.@mount[0].fstype=ext4
uci set fstab.@mount[0].enabled=1
uci set fstab.@mount[0].enabled_fsck=0
uci set fstab.@mount[0].options=rw,sync,noatime,nodiratime
uci commit
reboot