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Asus RT-N56U

Wireless network seems to be buged if you want to run both interfaces at the same time, see . A workaround is:

  1. Set the country code to a specific country on BOTH the 5 GHz radio AND the 2.4 GHz radio.
  2. Go to System > Startup, scroll down to Local Startup, add the line "sleep 2 && /etc/init.d/network restart" before the line "exit 0", and click Submit.
  3. Click System > Reboot > Perform reboot.

Note: latest trunk has this problem fixed. (tested r44618 and up)

Supported Versions

Version/Model Launch Date S/N OpenWrt Version Supported Model Specific Notes
v1 2011 - 14.07 Barrier Braker -
v2 May 2015 - Unsupported Known as RT-N56U B1; sold as regular RT-N56U, box and device indistinguishable from v1

Hardware Highlights

Version/Model CPU Ram Flash Network USB Serial JTag
v1 Ralink MIPS 74Kc@533MHz 128MiB 8MiB 5 x 1000 Yes 2 x USB 2.0 Yes Yes
v2 MediaTek MIPS 1004Kc@880MHz 128MiB 16MiB 5 x 1000 Yes 2 x USB 2.0 Yes Unknown


There are two ways to install OpenWrt. Over the WebUI and TFTP.


Either (recommended if you want a stable system) download a stable version of Barrier Braker squashfs-factory.bin for the initial flash. Use a "sysupgrade" file for any future updates if already on openwrt.

Chaos Calmer RC2; CC RC2 Factory.bin; CC RC2 sysupgrade.bin

Or (recommended if you need a system with all the newest features and do not care if the system may break) download latest snapshot of Chaos Calmer squashfs-factory.bin for the initial flash. Use a "sysupgrade" file for any future updates if already on openwrt.

Warning: Do NOT flash snapshot image of Chaos Calmer for initial flashing as nothing is ON in snapshot image. This means unless you have a serial connected you will not be able to access the router. You can, however, easily update from a stable release to a daily snapshot, but make sure "Keep Settings" checkbox is checked.

Alternative trunk builds (by moonman) with Luci included. Compiled with -march=74kc instread of -mips32r -mtune=74kc: As trunk advances some packages become broken and don't build. Be sure to check "broken_packages" directory to make sure a particular build is not missing packages that you need.

Install via WebUI

  • Log in your routers admin interface
  • Administration → Firmware Upgrade → Choose openwrt-ramips-rt3883-rt-n56u-squashfs-factory.bin.

Install via TFTP

  • Unplug router power cord
  • keep reset button down
  • plug the power cord back
  • release the reset button.
  • led blinks slowly when ready for flashing
  • Assign your PC on eth0
  • tftp
  • tftp> bin
  • tftp> put openwrt-ramips-rt3883-rt-n56u-squashfs-factory.bin
  • wait for it to stop flashing and then telnet to or visit with your browser to access the LUCI interface


untested but should work

  1. Download & Install the asus "Firmware Restoration" from asus website
  2. Download the factory image from asus
  3. Enter Recovery Mode
  4. Unplug Router
  5. Hold Reset Button and Plug in Router
  6. Release button when front LED flashes slowly
  7. Use the following to set up your TCP/IP settings:IP address: 192.168.1.x Subnet mask:
  8. Select firmware *.trx and upload



Architecture: MIPS
Vendor: Ralink
Bootloader: U-Boot
System-On-Chip: RT3662 (MIPS 74Kc V4.12)
CPU/Speed MIPS 74Kc @ 500 Mhz
Flash size: 8 MB
RAM: 128 MiB
Wireless: Ralink RT3662 + RT3092
Ethernet: RealTek RTL8367M Gigabit w/ vlan support swconfig
USB: Yes 2 x 2.0
Serial: Yes 57600

How to Open

Remove the screws first, then use your nails.

Ethernet Ports

The ports are numbered starting from the USB socket side, Ports 0,1,2 and 3 are LAN and port 4 is the WAN port.


|    XXXX        | GND RX TX 3.3
|                |
|                |
|                |

the diagram is when viewing the LED side of the board.


toh/asus/rt-n56u.txt · Last modified: 2016/01/11 01:52 by tmomas