Asus RT-AC66U

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Revision as of 20:54, 5 April 2014



  • 5th generation 802.11ac chipset gives you concurrent dual-band 2.4GHz/5GHz for up to super-fast 1.75Gbps
  • Gigabit Ethernet ports for the fastest, most reliable internet performance
  • AiRadar optimizes wireless coverage with detachable high-powered antennas
  • File sharing, printer sharing, and 3G sharing via two multi-functional built-in USB ports
  • IEEE 802.11a, IEEE 802.11b, IEEE 802.11g, IEEE 802.11n, IEEE 802.11ac, IEEE 802.3u, IPv4, IPv6
  • AC1750 ultimate AC performance; 450+1300Mbps
  • 802.11a : 6,9,12,18,24,36,48,54Mbps
  • 802.11b : 1, 2, 5.5, 11Mbps
  • 802.11g : 6,9,12,18,24,36,48,54Mbps
  • 802.11n : up to 450Mbps
  • 802.11ac: up to 1300Mbps
  • Detachable antenna x 3
  • 2.4GHz/5GHz
  • 64-bit WEP, 128-bit WEP, WPA2-PSK, WPA-PSK, WPA-Enterprise, WPA2-Enterprise
  • 1 x RJ45 for 10/100/1000 BaseT for WAN, 4 x RJ45 for 10/100/1000 BaseT for LAN, Support Ethernet and 802.3 with max. bit rate 10/100/1000 Mbps and auto cross-over function(MDI-X)
  • 2 x USB 2.0
  • WPS Button, Reset Button, Power Button


  1. Download the latest dd-wrt firmware from either the router database or from, latest version, folder asus-rt-ac66u/
  2. You need a telnet client. For example PuTTY
  3. Connect your computer to the router. The preferred way is via wired cable from the computer to one of the 4 ports on the router although via WIFI is also possible but if the wireless connection is lost while you upload the new firmware, well then you could be in trouble...

Installation instructions

  1. With your browser, login to the standard Asus UI page of the router (usually If this is the first time you do this it can be that you must go through a wizard to configure the standard setup.
  2. Enable Telnet by going to Advanced Settings > Administration > System > Enable Telnet and click on "Apply"
  3. Open a telnet connection to the router (usually Then enter your username and password for the router admin panel. By default both are admin. You should get the prompt (#) where you can enter the following commands.
  4. To clear the nvram: mtd-erase -d nvram
    You should get something like:
    Erasing 0x0 - 0xffff
    "nvram" successfully erased.
  5. Reboot the router: reboot
    You will loose telnet connection and the router reboots. Wait some time until this is done and then continue
  6. With your browser, login again to the standard Asus UI page of the router (usually Since we cleared nvram, you must again go through the wizard to configure the standard setup. The user/password was also reset to the default admin/admin.
  7. Navigate to: Administration > Firmware Upgrade > New Firmware File and click on Choose File and select the dd-wrt firmware file you downloaded and click on "Upload"
    Note: This step can take several minutes. Do not interrupt it. It is better to wait a minute longer than act too soon if you don't see nothing happening anymore. Once completed you should see the DD-WRT page however it can also happen that the page stays on the upload screen or even says that it can't load the next page. Wait a bit and then navigate again to
  8. This first dd-wrt page asks the new user name and password. Once these are provided you are in the dd-wrt pages.
  9. Enable Telnet by going to: Administration > Management > Remote Access > Telnet Management
  10. Open again a telnet connection to the router ( Then enter as username root and the password you used when changing the password. Note that the telnet username is always root, independent of the dd-wrt web username. You should get the prompt (#) where you can enter the following commands.
  11. Again clear NVRAM by typing: mtd -r erase nvram
    Note that after using the above command connection will be lost which is the expected behavior
  12. Reboot the router.
  13. With your browser, log back into the dd-wrt admin panel, you’ll need to reset again the username and password again.

You should now have a dd-wrt clean install.

Links and Notes