opendns

sysupgrade - se o firmware atual do router for openwrt

factory - se o firmware atual do router for o original da tplink

a versão do aparelho e do firmware têm que coincidir

ex:
openwrt-15.05.1-ar71xx-generic-tl-wr740n-v1-squashfs-factory.bin - firmware para router da versão v1(.x) ainda com firmware original

openwrt-15.05.1-ar71xx-generic-tl-wr740n-v4-squashfs-sysupgrade.bin - firmware para router da versão v4(.x) já com firmware openwrt

para testar alterar System|Schelude Tasks:

*/5 * * * * /usr/bin/curl -k -u 'user@domain.com:password' https://updates.opendns.com/nic/update

This is how I configured my FRITZ!Box Fon WLAN 7170. Using this configuration, I do not need to configure the various PCs in my home network. My phone is connected to the Fritz!Box. You should only do this if you are comfortable with unix commands like cd and vi.
1. Activate Telnet using the telephone with #96*7*
2. In the command prompt (cmd) enter telnet fritz.box
3. If a password is requested, enter your Fritz!Box password
4. Enter "cd /var/flash"
5. Enter "nvi ar7.cfg"