For gateway devices with limited memoy

git clone https://github.com/SotiriosVrachas/lede-project-source.git lede
cd lede
git checkout v17.01.1
make defconfig
make image -j 3 PROFILE=tl-wr703n-v1 PACKAGES="kmod-usb-ohci kmod-usb-uhci kmod-bluetooth kmod-bluetooth_6lowpan bluez-libs bluez-utils"

where 3 in

-j 3

is the number of CPU cores that you have available plus one and the tl-wr703n-v1 in

PROFILE=tl-wr703n-v1

is your device model.

scp bin/targets/*/*/*sysupgrade.bin root@lededevice:/tmp/sysupgrade.bin

lededevice

is the network address of the device.

ssh root@lededevice

sysupgrade /tmp/sysupgrade.bin