Firmware Update: Asus RT-N66U

Asus has released new firmware for the RT-N66U. This router can provide clients with network access both wired and wireless. 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 contains a lot of changes, so Asus recommends reverting to factory settings to avoid any problems. The update includes a completely new AiCloud, the router can be used as a repeater and more USB GSM modems are supported.

ASUS RT-N66U Firmware Version

Please note: This version add many new features, please press the reset button more than 5 seconds to reset the RT-N66U after firmware upgraded to prevent unexpected problem.

AiCloud 2.0 released

  • All new web interface
  • Support video subtitles (.srt format) For better video compatibility, windows user need to update VLC to v2.0.8 or later
  • File/ folder can be shared to Facebook(router must have public IP)
  • Supported mobile version web interface
  • Supported router-to-router sync. Please refer to this video
  • Fixed smart sync related issues.


  • Repeater mode (in Administration –> Operation mode)
  • Dual WAN (in WAN -> Dual WAN)
  • Unmount all disks with 1-click
  • Disk scan feature. It is in external USB disk status tab in network folder.
  • Support Sandisk Cruzer flash drive with both CD-ROM and flash disk interface.
  • Auto adjust time zone in internet setup wizard process.
  • PPTP VPN server status GUI
  • Recognized .rmvb files as video format in media server.
  • Show more detail information in USB application install process.


  • Upgraded to SDK6 driver to fix 5GHz connection issue.
  • Fixed HK ISP DHCP connection issue.
  • Fixed USB application update related issues.
  • Reduced the redundant packets when used 3G/4G dongle as WAN and opened web browser.
  • Fixed the traffic monitor related issues when used 3G/4G dongle as WAN,
  • Fixed client duplicated issue in network map
  • removed modem setting button in AP mode
  • Fixed IP related parental control issue.
  • Disabled the Broadcom ACSD service to prevent buffer overflow vulnerabilities.
  • Fixed AiCloud vulnerability related bugs.
  • Underline “_” can now be acceptable in device name and computer name.
  • Hide Broadcast option in PPTP VPN server when it is disabled.
  • Fixed multicast IPTV related issues in PPPoE/PPTP/L2TP connection.
  • Fixed parental control offset issue in IE.
  • Fixed 3G dongle related issue.
  • Hide ASUS DDNS description when selecting 3rd party service.
  • Fixed script error ‘invalid argument on IE’
  • Fixed smart sync JS error
  • Fixed JST timezone issue.


  • Fixed PPP IPv6 global address retrieval
  • added DHCP-PD option
  • Added LAN DHCPv6 server
  • Added network status GUI.
  • Added option domain name if available

3G/4G dongles

  • Support Yota LTE dongle LU150
  • Support ZTE LTE dongle MF821
  • Support 3G dongle Q110
  • Support Huawei EC306

Version number
Release status Final
Website Asus
File size


License type Freeware