Note: TP-Link also markets a very different router under the same name.
Even though it is marketed as a "3G travel router", the TL-WR720N does not include a 3G modem. It simply means that the OEM firmware and GUI support a certain range of USB 3G modems. OpenWRT supports USB 3G modems, too. The router is powered through either a AC source (100-240V, Chinese-style foldable plug, i.e. two prongs without hole), or a micro-USB socket stub (5V).
The domestic Chinese/Asian versions and those for the European and American markets differ significantly. Only the rectangular version available from China has been tested, so far.
|Model Version||Launch Date||OpenWrt Version Supported||Model Specific Notes|
|v3.0||N/A||trunk||Chinese version (rectangular)|
|Atheros AR9331@400MHz||32MiB||4MiB||2 x 100MBit||1 x 2.0||Yes||Unlikely|
- SoC: Atheros AR9331
- 802.11 b/g/n 150Mbps
- Powered via micro-USB (5V) or 100-240V
- Tiny form factor (Chinese version)
- 9.2cm x 7.5cm x 2.8cm case
As from 28 April 2013, support for the TL-WR720N is present in the Trunk version of OpenWrt, see this thread on the forum for further reference.
For generic failsafe mode howto: generic.failsafe.
- At boot time, when SYS led started to blink, click the RESET button.
- Then SYS led would blink a lot faster.
- Shell access can be achieved through telnet with a network cable connected to the port which should be labeled as WAN (as of revision r37374).
- From there, follow the generic failsafe mode instructions should be fine.
There is a patch for TL-WR720N-v3 to make failsafe work on LAN port.
With thanks to mveplus who posted these pictures in the forum thread.
TP_IN is RX, TP_OUT is TX, and you may solder a ground above R323. The connection speed is 115200, N, 8, 1.
user: root pass: 5up
To access the u-boot bootloader, enter 'tpl'+<enter> when the 'Autoboot in 1 sec' message is displayed.
- you could read about bootloader in general
Forum member pepe2k made a modification of U-Boot for TP-Link with AR9331 SoC routers. This modification is based on wr703n-uboot-with-web-failsafe project, but has some improvements and other modifications. Most of pepe2k's work was focused on web failsafe mode - he rebuild it and now it works with all browsers and allow to upload not only firmware but also the U-Boot and ART data. Special support for 4MiB, 8MiB, and 16MiB Flash memory was added.
pepe2k wrote an article about this project: Modified U-Boot for the TP-Link WR703N/MR3020/MR3040 (Atheros AR9331) with web upgrade mode (in Polish), or you can use Google Translate.
You can download ready U-Boot images (64 KiB, for different models) from here: http://www.tech-blog.pl/pliki/u-boot_for_tp-link_AR9331_by_pepe2k.tar.gz
If you need other version, you should compile the code (please, see Makefile in top dir and make customization which you need) or send pepe2k a pm, he will do it for you.
You can download sources code here: http://www.tech-blog.pl/pliki/u-boot_sources_for_tp-link_AR9331_by_pepe2k.tar.gz
toh/tp-link/tl-wr720n.txt · Last modified: 2013/11/17 10:17 by zhang3