Download Firmware Asus RT-AC66U

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Asus recently released new firmware for the RT-AC66U. This router can provide clients with network access both wired and wireless. Wireless supports the unofficial 802.11ac standard, with a speed of up to 1.3Gbit/s. There are also two USB ports, so that a printer or external storage can be shared over the network. The new firmware has been given version number and the changelog shows the following changes and improvements:


  • Potential security issue from UPnP overflow.
  • Wireless time control related bugs.
  • Media server related issues when lan subnet change or USB hot plug
  • IPv6 over PPPoE interoperability issues.
  • PPPoE password setting error in Advanced wan setting.


  • Upgrade to latest Broadcom driver.
  • Enhance the PPPoE NAT throughput.
  • Enhance both 2.4GHz and 5GHz throughput.
  • Support Huawei E353 3G/4G USB dongle.
  • The router setting URL is changed to use the original URL can also go to the setting page.


  • Optimize for XBOX option in Advanced Setting–>Wireless–>General. Enable this function can stabilize streaming speed.
  • Network tools in Advanced setting
  • WOL user interface (wake on LAN)
  • H.323 and SIP passthrough can be disabled in Advanced Settings –> WAN –>NAT Passthrough
  • Click the device name and lookup the manufacturer information
  • Change the DHCP query frequency in Advanced settings–>WAN–>Internet connection to resolve the ISP compatibility issue.


  • Add deleted button in upload file page.
  • Fixed share link management bugs.
  • Fixed the file and folder rename bugs.
  • Fixed IE9 file upload compatibility issue.

Known issues

  • The router need to reboot after 3G/4G USB dongle setting. It caused longer setting time. If you use the 3G/4G router mode, we recommend staying in
  • The Media bridge throughput is not as good as If you use the 3G/4G router mode and media bridge mode, we recommend staying in

Version number
Release status Final
Website Asus
File size


License type Freeware
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