make sure its a v2 from the sticker on the bottom of the box or the bottom of the router its a great buy for 60-80 dollars. web update the 700 mhz router with the latest factory image of LEDE 17.10
rename to something shorter like openwrt.bin then use the tplink firmware updater lede-17.01.4-ar71xx-generic-archer-c7-v2-squashfs-factory.bin should work everytime.
one of my v2 routers had an issue with openwrt that just worked on another v2 router. this router features 5 ghz which over short ranges 150 – 250 feet works great. some say 1km range are doable but i dont see how it could.
opkg update with the network plugged into the wan or connect via wireless using luci http://192.168.1.1
opkg install block-mount kmod-fs-ext4 kmod-usb-storage-extras kmod-usbip kmod-usbip-server kmod-usbip-client kmod-sound-soc-ac97 kmod-input-core swap-utils kmod-rt2800-lib kmod-rt2800-usb kmod-rt2x00-lib kmod-rt2x00-usb kmod-usb-uhci kmod-usb2-pci kmod-usb-storage-extras kmod-usb-audio kmod-usb3 kmod-usbmon usbutils libusb-1.0 ll libusb-compat
once you get these on plug in a usb drive with a ext 3 partition and a swap partition . goto the luci/lede web mount interface and select the drive you just plugged in set it to overlay root, add swap after. then reboot router. if you had a password set before it should be a new config asking for a new password, is an easy way to check if it worked.
optional extras that are fun to have
libffmpeg-full ffmpeg libogg sox pulseaudio-daemon alsa-utils madplay mpd moc kmod-rtlwifi kmod-rtlwifi-usb kmod-usb-serial-pl2303 r8188eu-firmware