openwrt-ramips-mt76x8-tplink_c50-v4-squashfs-factory.bin
Wait for it to reboot.
connect the router to an internet connection with cable (lan port on another router works fine).
Connect with Putty to the IP address of the router.
username: root
type opkg update
then type opkg install luci
then open a browser and type http://routerip
You should now see LUCI like this. 