Since 18.06, OpenWrt no longer provide image for tl-wr703n because of default 4m flash is not enough.
If you want to use latest OpenWrt on your modified tl-wr703n.
You have to build it on your own.

Precompiled

Download my precompiled OpenWrt image for tl-wr703n from here:
https://downloads.hackinggate.com

TL-WR703N-OpenWrt-19.07.0.png TL-WR703N-OpenWrt-16m.png

Prepare to Build

Please read Install build system and Quick Image Building Guide.

Make sure all dependencies are installed.

Clone source code and install feeds

git clone https://github.com/openwrt/openwrt.git
cd openwrt
git checkout v19.07.0
./scripts/feeds update -a
./scripts/feeds install -a

This will build the latest Snapshot. If you want stable release. git checkout [TAG].

Make sure there’s no dependency error.

Make sure there’s enougth RAM or Swap.

Add tl-wr703n-v1 defination

After I took some look at the source code.
Edit target/linux/ar71xx/image/generic-tp-link.mk.
Add the tl-wr703n-v1 define above tl-wr710n-v1. Note the TPLINK_HWID is different with tl-wr710n.
If you have modified flash. For me it’s 16m.

define Device/tl-wr703n-v1
  $(Device/tplink-16mlzma)
  DEVICE_TITLE := TP-LINK TL-WR703N v1
  DEVICE_PACKAGES := kmod-usb-core kmod-usb2
  BOARDNAME := TL-WR703N
  DEVICE_PROFILE := TLWR703
  TPLINK_HWID := 0x07030101
  CONSOLE := ttyATH0,115200
  IMAGE/factory.bin := append-rootfs | mktplinkfw factory -C US
endef
TARGET_DEVICES += tl-wr703n-v1

Configure Build

Use this config.seed (modify link if you are building for stable release)

wget https://downloads.openwrt.org/releases/19.07.0/targets/ar71xx/generic/config.buildinfo -O config.buildinfo
rm -rf .config*
mv config.buildinfo .config

Add the following two lines to .config

CONFIG_TARGET_DEVICE_ar71xx_generic_DEVICE_tl-wr703n-v1=y
CONFIG_TARGET_DEVICE_PACKAGES_ar71xx_generic_DEVICE_tl-wr703n-v1=""

You should see TP-LINK TLWR703N v1 appeared in Target Devices.

make defconfig
make menuconfig

Start to Build

This will take minutes to hours.

nohup time make -j20 V=s &

Log file is nohup.out

View real time log via tail -f nohup.out

Troubleshooting

If you see error like this.

WARNING: Makefile 'package/feeds/luci/luci-proto-modemmanager/Makefile' has a dependency on 'modemmanager', which does not exist
WARNING: Makefile 'package/feeds/packages/meson/Makefile' has a dependency on 'python3-pkg-resources', which does not exist

Try do this.

./scripts/feeds uninstall meson luci-proto-modemmanager

And don’t forget to apply.

make defconfig

Clean the build.

make clean

If still failing, try -j1 to see real error.

make -j1 V=s

In my case, openvswitch-2.11.0 was failed to build.

./scripts/feeds uninstall openvswitch

Flash Image

Upload image to router (OpenWrt) and upgrade.

scp bin/targets/ar71xx/generic/openwrt-ar71xx-generic-tl-wr703n-v1-squashfs-sysupgrade.bin [email protected]:/tmp/
ssh [email protected]
sysupgrade -i /tmp/openwrt-ar71xx-generic-tl-wr703n-v1-squashfs-sysupgrade.bin

After install

I have some tips for you. Shell script for upgrade all packages, DNS-over-TLS, etc.
https://gist.github.com/HackingGate/b75ac856397075756ea878380c5b848c